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We have had ice ages and warmer periods when alligators were found in Spitzbergen.

CO2 emissions are continuing to rise due to the burning of fossil fuels and land-use change.

Most of the atmospheric moisture originates in the tropical ocean, and the difference between surface and upper atmospheric temperature determines how much of the moisture rises into the atmosphere.

Human-caused increases in greenhouse gases are responsible for most of the observed global average surface warming of roughly 0.8 °C (1.5 °F) over the past 140 years.

“We indicated 23 years ago — in our 1994 Nature article — that climate models had the atmosphere’s sensitivity to CO2 much too high,” Christy said in a statement.

These external forcings can be natural, such as variations in solar intensity and volcanic eruptions, or caused by humans.

The Earth’s climate is changing in response to increasing concentrations of greenhouse gases (GHGs) and particulate matter in the atmosphere, largely as the result of human activities.

Scientists have determined that the major factors causing the current climate change are greenhouse gases, land use changes, and aerosols and soot.

While there are uncertainties with climate models, they successfully reproduce the past and have made predictions that have been subsequently confirmed by observations.

Many physical impacts of global warming are already visible, including extreme weather events, glacier retreat, changes in the timing of seasonal events (e.g., earlier flowering of plants), sea level rise, and declines in Arctic sea ice extent.

NASA Finds Antarctica is Gaining Ice,

"A 40-y record reveals gradual Antarctic sea ice increases followed by decreases at rates far exceeding the rates seen in the Arctic".

The sea level was 20 to 30 feet higher than it is today, implying that the ice sheets in both Greenland and Antarctica must have partly disintegrated, a warning of what could occur in the relatively near future if the heating of the planet continues unchecked.”

Both the Greenland ice sheet and Antarctica have tipping points for warming levels that could be reached before the end of the 21st century.

Growers regularly pump CO2 into greenhouses, raising levels to three times that of the natural environment, to produce stronger, greener, healthier plants.”

To increase yield further, some sealed greenhouses inject CO2 into their environment to help improve growth and plant fertility.

Polar bear numbers are increasing.

The Intergovernmental Panel on Climate Change said the likelihood was 90 percent to 99 percent that emissions of heat-trapping greenhouse gases like carbon dioxide, spewed from tailpipes and smokestacks, were the dominant cause of the observed warming of the last 50 years.

Rising CO2 increases atmospheric water vapor, which makes global warming much worse.

Since 1950, the number of cold days and nights have decreased, and the number of warm days and night have increased.

The EPA director under Obama said the Clean Power Initiative would have no effect on man-made CO2 emissions.

The Clean Power Plan was an Obama administration policy aimed at combating global warming that was first proposed in 2014.

And there is a lot of evidence that climate change is diminishing biodiversity, which can be seen in these alpine meadows as well.

Climate change has proven to affect biodiversity and evidence supporting the altering effects is widespread.

Last year’s warmth was manifested across the planet, from the warm tropical ocean waters off the coast of northeastern Australia, where the Great Barrier Reef experienced its worst coral bleaching event on record and large scale coral death, to the Arctic, where sea ice hit regular monthly record lows and overall temperatures were also the warmest on record, at least from January through September 2016.

Human activities therefore allow species to migrate to new areas (and thus become invasive) occurred on time scales much shorter than historically have been required for a species to extend its range.

“For example, Canadian polar bear biologist Ian Stirling learned in the 1970s that spring sea ice in the southern Beaufort Sea periodically gets so thick that seals depart, depriving local polar bears of their prey and causing their numbers to plummet.

In essence, a tropical monsoon climate tends to either see more rainfall than a tropical savanna climate or have less pronounced dry seasons.

Mass coral bleaching is a new phenomenon and was never observed before the 1980s as global warming ramped up.

The first recorded mass bleaching event that took place in the Belize Barrier Reef was in 1998, where sea level temperatures reached up to 31.5 °C (88.7 °F) from 10 August to 14 October.

Warmer seasons or triennial phases are followed by an atmosphere that is rich in CO2, reflecting the gas solving or exsolving from water, and not photosynthesis activity.

It is thought that there have been at least 30 El Niño events since 1900, with the 1982–83, 1997–98 and 2014–16 events among the strongest on record.

Multiple lines of evidence make it very clear that the rise in atmospheric CO2 is due to human emissions.

While ‘climate change’ can be due to natural forces or human activity, there is now substantial evidence to indicate that human activity – and specifically increased greenhouse gas (GHGs) emissions – is a key factor in the pace and extent of global temperature increases.

The Review concluded that CRU's actions were normal and did not threaten the integrity of peer review.

It found that the CRU's work had been "carried out with integrity" and had used "fair and satisfactory" methods.

[subsidies for wind and solar] add to emissions because coal-fired elec­tricity needs to be on standby for when there is no wind or sunshine.

Although the natural absorption of CO 2 by the world's oceans helps mitigate the climatic effects of anthropogenic emissions of CO 2, it is believed that the resulting decrease in pH will have negative consequences, primarily for oceanic calcifying organisms.

The research also revealed how large areas of the polar ice caps could collapse and significant changes to ecosystems could see the Sahara Desert become green and the edges of tropical forests turn into fire-dominated savanna.

Regime shifts in polar regions include the melting of the Greenland ice sheet and the possible collapse of the thermohaline circulation system.

A major part of the climate change bill sponsored by Sens. John Kerry and Joe Lieberman "was essentially written by BP."

On December 10, 2009, Graham co-sponsored a letter to President Barack Obama along with then Senators John Kerry and Joe Lieberman announcing their commitment to passing a climate change bill and outlining its framework.

Greenland ice sheet won't collapse

James E. Hansen has argued that multiple positive feedbacks could lead to nonlinear ice sheet disintegration much faster than claimed by the IPCC.

If Senator Wong was really serious about her science she would stop breathing because you inhale air that's got 385 parts per million carbon dioxide in it

CO 2 currently forms about 410 parts per million (ppm) of earth's atmosphere, compared to about 280 ppm in pre-industrial times, and billions of metric tons of CO 2 are emitted annually by burning of fossil fuels.

The Greenland and Antarctic ice sheets have decreased in mass.

From about 11 million years ago to 10 million years ago, the Greenland Ice Sheet was greatly reduced in size.

Ancient natural cycles are irrelevant for attributing recent global warming to humans.

Anthropogenic climate change is caused by human activity, as opposed to changes in climate that may have resulted as part of Earth's natural processes.

Not only is there no scientific evidence that CO2 is a pollutant, higher CO2 concentrations actually help ecosystems support more plant and animal life.

Storm surge and heavy rainfall contributed to flooding, particularly in low-lying locales and across New Hampshire.

Humans are too insignificant to affect global climate.

The planet is now 0.8 °C warmer than in pre-industrial times.

This growth stimulation occurs because CO2 is one of the two raw materials (the other being water) that are required for photosynthesis.

Research shows that the Arctic may become ice-free in the summer for the first time in human history by 2040.

There are a myriad of other radiative forcings that affect the planet's energy imbalance.

In 2011, Portman voted to limit the government's ability to regulate greenhouse gas emissions, and in 2015, he voted against the Clean Power Plan.

But more than 7% of deaths are related to cold—counting hypothermia, as well as increased blood pressure and risk of heart attack that results when the body restricts blood flow in response to frigid temperatures.”

Palin considers herself a conservationist and during the 2008 campaign demonstrated her skepticism about global warming politics, saying "of global warming, climate change, whether it's entirely, wholly caused by man's activities or is part of the cyclical nature of our planet...John McCain and I agree that we have to make sure that we're doing all we can to cut down on pollution."

[…]until we develop a practical, cost-competitive alternative to fossil fuels, it is unlikely that renewable energy will ever make up more than 15-20% of global energy requirements.

Another 2013 study found, contrary to Svensmark's claims, "no statistically significant correlations between cosmic rays and global albedo or globally averaged cloud height."

Ice berg melts, ocean level remains the same.

"The melting of floating ice raises the ocean level".

There is a link between climate change and the NSW bushfires.

There was solar brightening beyond 2000 at numerous stations in Europe, the United States, and Korea.

In the process, the cows will emit much greenhouse gas, and they will consume far more calories in beans than they will yield in meat, meaning far more clearcutting of forests to farm cattle feed than would be necessary if the beans above were simply eaten by people.”

"A tipping point in refreezing accelerates mass loss of Greenland's glaciers and ice caps".

In the process, the cows will emit much greenhouse gas, and they will consume far more calories in beans than they will yield in meat, meaning far more clearcutting of forests to farm cattle feed than would be necessary if the beans above were simply eaten by people.”

Since the mid-20th century, most of the observed warming is "likely" (greater than 66% probability, based on expert judgement) due to human activities.

Greenland's ice loss is accelerating & will add metres of sea level rise in upcoming centuries.

It is tied with 2005's Hurricane Katrina as the costliest tropical cyclone on record, inflicting $125 billion (2017 USD) in damage, primarily from catastrophic rainfall-triggered flooding in the Houston metropolitan area and Southeast Texas.

The report […] found that the United States was one of the most pollution-free nations in the world.”

"Weather Channel boss calls global warming 'the greatest scam in history'".

The thermal expansion of the oceans, compounded by melting glaciers, resulted in the highest global sea level on record in 2015.

This acceleration is due mostly to human-caused global warming, which is driving thermal expansion of seawater and the melting of land-based ice sheets and glaciers.

They tell us that we are the primary forces controlling earth temperatures by the burning of fossil fuels and releasing their carbon dioxide.

Anders Jonas Ångström (Swedish: [ˈânːdɛʂ ˈjûːnas ˈɔ̂ŋːstrœm]; 13 August 1814 – 21 June 1874) was a Swedish physicist and one of the founders of the science of spectroscopy.

Both the extent and thickness of Arctic sea ice has declined rapidly over the last several decades.

A 2007 study by David Douglass and coworkers, concluded that the 22 most commonly used global climate models used by the IPCC were unable to accurately predict accelerated warming in the troposphere although they did match actual surface warming, concluding "projections of future climate based on these models should be viewed with much caution".

Steve McIntyre noticed a strange discontinuity in US temperature data, occurring around January 2000.

The adjustment reduced the average temperatures for the continental United States by about 0.15 °C during the years 2000-2006.

CO2 increase is natural, not human-caused

Measurements of CO 2 from the Mauna Loa observatory show that concentrations have increased from about 313 parts per million (ppm) in 1960, passing the 400 ppm milestone on May 9, 2013.

Ice mass loss is occuring at an accelerated rate in Greenland, Antarctica and globally from inland glaciers.

Eventually the Earth will be uninhabitable, at the latest when the Sun becomes a red giant in about 5 billion years.

Pluto's climate change over the last 14 years is likely a seasonal event.

A 2018 study of the thickness of sea ice found a decrease of 66% or 2.0 m over the last six decades and a shift from permanent ice to largely seasonal ice cover.

Greenland has only lost a tiny fraction of its ice mass.

If iceberg calving has happened as an average, Greenland lost 294 Gt of its mass during 2007 (one km3 of ice weighs about 0.9 Gt).

"I mean, it - I mean - and I tell somebody, I said, just because you have a group of scientists that have stood up and said here is the fact, Galileo got outvoted for a spell" (Texas Governor Rick Perry)

Since the last glacial maximum about 20,000 years ago, the sea level has risen by more than 125 metres (410 ft), with rates varying from less than a mm/year to 40+ mm/year, as a result of melting ice sheets over Canada and Eurasia.

According to the study, as carbon levels have risen, the cold air at high altitudes over the tropics has actually grown colder.

Less energy reaches the upper atmosphere, which is therefore cooler because of this absorption.

Every year air pollution protections are delayed, another 34,000 people will die prematurely.

In 2019, the British Parliament became the first national government in the world to officially declare a climate emergency.

“Catherine Senior, head of understanding climate change at the Met Office Hadley Centre, said more studies and more data were needed to fully understand the role of clouds and aerosols.

By the first half of 2016, only 10 vehicles were manufactured per day in Venezuela with production dropping 86%.

The amount of heat energy coming out of the Earth is too small to even be worth considering.

To cut carbon emissions by 15% below 2000 levels by 2020 if there is an agreement where major developing economies commit to substantially restrain emissions and advanced economies take on commitments comparable to Australia.

Rather than 100 years of unprecedented global warming as predicted by IPCC, the global temperatures have leveled off and we seem to be heading for cooler weather."

On the basis of available data, climate scientists are now projecting an average global temperature rise over this century of 2.0 to 4.5°C.

The Petition Project features over 31,000 scientists signing the petition stating "there is no convincing scientific evidence that human release of carbon dioxide will, in the forseeable future, cause catastrophic heating of the Earth's atmosphere".

There is no convincing scientific evidence that human release of carbon dioxide, methane, or other greenhouse gases is causing or will, in the foreseeable future, cause catastrophic heating of the Earth's atmosphere and disruption of the Earth's climate.

"Global warming data apparently cooked by U.S. government-funded body shows astounding temperature fraud with increases averaging 10 to 15 degrees Fahrenheit.

This heat, in the form of infrared radiation, gets absorbed and emitted by these gases in the atmosphere, thus warming the lower atmosphere and the surface.

“Typically, in such an attribution study, scientists will use sets of climate models — one set including the factors that drive human global warming and the other including purely “natural” factors — and see if an event like the one in question is more likely to occur in the first set of models.

Therefore, climate models are used to study how individual factors affect climate.

We note that the Earth has never in its history had a quasi-stable state that is around 2C warmer than the preindustrial and suggest that there is substantial risk that the system, itself, will ‘want’ to continue warming because of all of these other processes – even if we stop emissions,” she said.

Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid.

Far from contradicting global warming, record snowfall is predicted by climate models and consistent with our expectation of more extreme precipitation events.

Under the influence of global warming, melt at the base of the ice sheet increases.

In their worst-case scenario, the sea level could rise by six feet by the end of this century, and the pace could pick up drastically in the 22nd century.

The issues with tree rings had not been hidden, but were extensively discussed in scientific literature and in IPCC reports.

The past shows that climate change is normal, that warmer times and more atmospheric carbon dioxide have driven biodiversity and that cold times kill.”

There is no convincing scientific evidence that human release of carbon dioxide, methane, or other greenhouse gases is causing or will, in the foreseeable future, cause catastrophic heating of the Earth's atmosphere and disruption of the Earth's climate.

Dropped stations introduce warming bias

Decades ago, they correctly predicted how much Earth's temperature would rise due to increasing atmospheric CO2.

Arctic summer sea ice has shrunk by an area equal to Western Australia, and might be all gone in a decade.

Impacts include the direct effects of extreme weather, leading to injury and loss of life; and indirect effects, such as undernutrition brought on by crop failures.

"...there is the contention by Wolfgang Knorr of the Department of Earth Sciences at the University of Bristol in England that carbon dioxide levels in the atmosphere are about where they were 160 years ago." (as quoted by Ken Ward Jr.)

At a meeting of the American Geophysical Union (December 17, 2008), scientists detailed evidence in support of the controversial idea that the introduction of large-scale rice agriculture in Asia, coupled with extensive deforestation in Europe began to alter world climate by pumping significant amounts of greenhouse gases into the atmosphere over the last 1,000 years.

Increases in atmospheric CO2 followed increases in temperature.

For his postdoctoral research, Mann joined Bradley and tree ring specialist Malcolm K. Hughes to develop a new statistical approach to reconstruct underlying spatial patterns of temperature variation combining diverse datasets of proxy information covering different periods across the globe, including a rich resource of tree ring networks for some areas and sparser proxies such as lake sediments, ice cores and corals, as well as some historical records.

The fact that so many studies on climate change don't bother to endorse the consensus position is significant because scientists have largely moved from what's causing global warming onto discussing details of the problem (eg - how fast, how soon, impacts, etc).

This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports.

Jupiter's climate change is due to shifts in internal turbulence fueled from an internal heat source - the planet radiates twice as much energy as it receives from the sun.

From 2008 to 2011, Arctic sea ice minimum extent was higher than 2007, but it did not return to the levels of previous years.

For the past 4567 million years, the sun and the Earth’s orbit have driven climate change cycles.

Some critics have contended that the IPCC reports tend to be conservative by consistently underestimating the pace and impacts of global warming, and report only the "lowest common denominator" findings.

The United States is the leading nation in the world "with the highest amount of doubt about the conventional wisdom of climate change."

The Gulf of Mexico is known for hurricanes in August, so their incidence alone cannot be attributed to global warming, but the warming climate does influence certain attributes of storms.

describes a world of worsening food shortages and wildfires, and a mass die-off of coral reefs as soon as 2040

While ‘climate change’ can be due to natural forces or human activity, there is now substantial evidence to indicate that human activity – and specifically increased greenhouse gas (GHGs) emissions – is a key factor in the pace and extent of global temperature increases.

Converting to these cleaner sources [of energy] may be somewhat costlier in the short term, but they could ultimately pay for themselves by heading off climate damages and reducing health problems associated with dirty air.

In the scientific literature, there is an overwhelming consensus that global surface temperatures have increased in recent decades and that the trend is caused mainly by human-induced emissions of greenhouse gases.

Satellites measure Antarctica losing land ice at an accelerating rate.

A satellite record revealed that the overall increase in Antarctic sea ice extents reversed in 2014, with rapid rates of decrease in 2014–2017 reducing the Antarctic sea ice extents to their lowest values in the 40-y record.

...Livestock are responsible for 18 per cent of the greenhouse gases that cause global warming, more than cars, planes and all other forms of transport put together.

During the late 20th century, a scientific consensus evolved that increasing concentrations of greenhouse gases in the atmosphere cause a substantial rise in global temperatures and changes to other parts of the climate system, with consequences for the environment and for human health.

‘But even if an organism isn’t directly harmed by acidification it may be affected indirectly through changes in its habitat or changes in the food web.’

Changes in ocean chemistry can have extensive direct and indirect effects on organisms and their habitats.

More than 500 scientists and professionals in climate and related fields have sent a 'European Climate Declaration' to the Secretary-General of the United Nations

This scientific opinion is expressed in synthesis reports, by scientific bodies of national or international standing, and by surveys of opinion among climate scientists.

Gov. Palin ... is somebody who actually doesn't believe that climate change is man-made.

Compared to plant milks, cow's milk requires the most land and water, and its production results in the greatest amount of greenhouse gas (GHG) emissions, air pollution, and water pollution.

Until last June, most scientists acknowledged that warming reached a peak in the late 1990s

Cumulative anthropogenic (i.e., human-emitted) emissions of CO 2 from fossil fuel use are a major cause of global warming, and give some indication of which countries have contributed most to human-induced climate change.

There are many lines of evidence which clearly show that the atmospheric CO2 increase is caused by humans.

The warming evident in the instrumental temperature record is consistent with a wide range of observations, documented by many independent scientific groups; for example, in most continental regions the frequency and intensity of heavy precipitation has increased.

Observed sea levels are actually tracking at the upper range of the IPCC projections.

The history of the Himalayas broadly fits the long-term decrease in Earth's average temperature since the mid-Eocene, 40 million years ago.

The amount of energy used to construct solar and wind facilities is greater than they produce in their working lives.

In Alaska, the effects of sea ice shrinkage have contributed to higher mortality rates in polar bear cubs, and have led to changes in the denning locations of pregnant females.

The figure traditionally cited that suggests 97 per cent of climate scientists agree that global warming is man-made was also found to be flawed.

In the scientific literature, there is an overwhelming consensus that global surface temperatures have increased in recent decades and that the trend is caused mainly by human-induced emissions of greenhouse gases.

Small increases in average temperature translate to big increases in the number of extremely hot days, and those hot days have a big impact.

Global warming refers to the long-term rise in the average temperature of the Earth's climate system.

more than 100 per cent of the warming over the past century is due to human actions.

The view that human activities are likely responsible for most of the observed increase in global mean temperature ("global warming") since the mid-20th century is an accurate reflection of current scientific thinking.

“Dr Browman, a marine scientist for 35 years, said he was not saying that ocean acidification posed no threat, but that he believed that “a higher level of academic scepticism” should be applied to the topic.

Ocean acidification poses a severe threat to the earth's natural process of regulating atmospheric C02 levels, causing a decrease in water's ability to dissolve oxygen and created oxygen-vacant bodies of water called "dead zones."

Ever since 2012, scientists have been debating a complex and frankly explosive idea about how a warming planet will alter our weather — one that, if it’s correct, would have profound implications across the Northern Hemisphere and especially in its middle latitudes

Over several decades of development, models have consistently provided a robust and unambiguous picture of significant climate warming in response to increasing greenhouse gases.

Over 97 percent of the scientific community … believe that humans are contributing to climate change.

Of these, 97% agree, explicitly or implicitly, that global warming is happening and is human-caused.

“It’s far too early to tell if what we are seeing in the Arctic, and now the Antarctic, is a sharp shift towards warmer poles with less ice.

Surface temperature increases are greatest in the Arctic, which has contributed to the retreat of glaciers, permafrost, and sea ice.

Extreme weather events are being made more frequent and worse by global warming.

"Today's Energy Jobs Are in Solar, Not Coal".

There is no question whatsoever that the CO2 increase is human-caused.

The National Geographic wrote that the concentration of carbon dioxide in the atmosphere is this high "for the first time in 55 years of measurement—and probably more than 3 million years of Earth history."

The bottom line is there’s no solid connection between climate change and the major indicators of extreme weather

The rate of Arctic cooling is roughly 0.02 °C per century.

In Alaska, brown bears are changing their feeding habits to eat elderberries that ripen earlier.

The impact on the environment, ecosystems, the animal kingdom, society and humanity depends on how much more the Earth warms.

CO2 increase is natural, not human-caused.

[clarification needed] This increase is the result of human activities by burning fossil fuels, deforestation and forest degradation in tropical and boreal regions.

Over the past eight years, the United States has reduced our total carbon pollution more than any other nation on Earth.

In the cumulative emissions between 1850 and 2007, the U.S. was at the top in terms of all world nations, involved with 28.8% of the world's total.

While changes in cloud cover & aerosols lead to more sunlight hitting the surface, this can be compensated by the cooling effect on the atmosphere due to fewer clouds trapping less warmth and fewer absorbing aerosols absorbing less sunlight.

Ozone acts as a greenhouse gas, absorbing some of the infrared energy emitted by the earth.

It is clear, then, that greening is emerging as a factor with the potential to blunt some of the worst impacts of human greenhouse gas emissions.

The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms.

Ice mass loss is occuring at an accelerated rate in Greenland, Antarctica and globally from inland glaciers.

Attribution of recent climate change is the effort to scientifically ascertain mechanisms responsible for recent global warming and related climate changes on Earth.

"I mean, it - I mean - and I tell somebody, I said, just because you have a group of scientists that have stood up and said here is the fact, Galileo got outvoted for a spell" (Texas Governor Rick Perry)

Perry was re-elected to a second full term in office, winning 39% of the vote to Bell's 30%, Strayhorn's 18% and Friedman's 12%.

Migration patterns show people heading for warm states like Texas and Florida, not snowy Minnesota and Michigan.”

Having almost no atmosphere to retain heat, it has surface temperatures that vary diurnally more than on any other planet in the Solar System, ranging from 100 K (−173 °C; −280 °F) at night to 700 K (427 °C; 800 °F) during the day across the equatorial regions.

The warming trend is the same in rural and urban areas, measured by thermometers and satellites, and by natural thermometers.

For example, urban and rural trends are very similar.

Satellites measure Antarctica losing land ice at an accelerating rate.

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere.

"In 2007, the Northern Hemisphere reached a record low in ice coverage and the Northwest Passage was opened.

The extreme loss in 2007 rendered the passage "fully navigable".

Correspondingly, the global surface temperature has also dropped."

Data points to an average drop in temperature of about 2 °C (3.6 °F) in this period.

Venus is not hot because of a runaway greenhouse.

The introduction includes this statement: There is strong evidence that the warming of the Earth over the last half-century has been caused largely by human activity, such as the burning of fossil fuels and changes in land use, including agriculture and deforestation.