Global Warming & CO2

Global warming is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth's mean surface temperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980. Now in 2012, the themperature is about 0.6 °C higher than in 1980.


The reality of Global Warming…

Global mean land-ocean temperature change from 1880–2011, relative to the 1951–1980 mean. The black line is the annual mean and the red line is the 5-year running mean. The green bars show uncertainty estimates. Source: NASA GISS.

… is linked with the CO2 in the atmosphere.

Warming of the climate system is unequivocal, and scientists are more than 90% certain that it is primarily caused by increasing concentrations of greenhouse gases produced by human activities such as the burning of fossil fuels and deforestation. These findings are recognized by the national science academies of all major industrialized nations.

The greenhouse effect

Temperature shows a slight cooling trend while CO2 has been rising steadily. If CO2 causes warming, shouldn't temperature be rising steadily also? However, if we look at the temperature record over the past several decades, we see that even in a long term warming trend, there are short periods of cooling.

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