Rational numbers: {p/q | p and q are integers, and q =0}: Real numbers: {x | x is a number that can be written as a decimal}. Irrational numbers: {x | x is a real number andx cannot be written as a quotient of integers.}. Deï¬nitions: â¢ The number of elements in a set is called the cardinal number,orcardinality,oftheset. The symbol n(A), which is read ân of A,â represents the cardinal number of the setA.
The Intergovernmental Panel on Climate Change (IPCC) reported in 2014 that scientists were more than 95% certain that global warming is mostly being caused by human (anthropogenic) activities, mainly increasing concentrations of greenhouse gases such as methane and carbon dioxide (CO2).
The cause of global warming is human activity, specifically the burning of fossil fuels which releases millions of tons of carbon dioxide into the atmosphere every year.As the amount of carbon dioxide increases in the atmosphere, more of the sun's radiant energy is trapped as heat, causing global warming.Other activities that are contributing to global warming include massive deforestation projects and the emission of methane and several other air pollutants.he cause of global warming is human activity, specifically the burning of fossil fuels which releases millions of tons of carbon dioxide into the atmosphere every year.