by Davis Burroughs
Scientists have learned a lot about climate change since first discovering the greenhouse effect in 1824.
Their projections have been largely on point. In 1896, Svante Arrhenius calculated that if humans doubled atmospheric C02, then earth's temperature would rise by 5 C (9 F). One hundred years later, our estimate, 3 - 5 C (5.4 - 9 F) is not so different.
And while the Intergovernmental Panel on Climate Change warns that we have 12 years to hold global warming to moderate levels (<1.5 C), their report also confirms such a change is still within reach.
Thanks to University of Virginia professor Deborah Lawrence for compiling these findings.