CO2 is released through burning fossil fuels, as well as natural processes such as volcanic eruptions. CO2 levels have consistently risen since the 1950's and are the highest levels they've been in 3 MILLION YEARS. Must be all those pesky volcanoes!
Earth's carbon dioxide levels highest in 3 million years, study says
Carbon dioxide – the gas scientists say is most responsible for global warming – has reached ... more
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