claim: The planet's average surface temperature has risen about 1.62 degrees Fahrenheit ( 0.9 degrees Celsius ) since the late 19th century, a change driven largely by increased carbon dioxide and other human-made emissions into the atmosphere.
evidence: 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.