Global Warming

by NASA Center for Climate Simulation

Title

Global Warming

Artist

NASA Center for Climate Simulation

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Photograph - Photograph

Description

A new NASA study suggests that projections of Earth's future warming should be more in line with previous estimates that indicated a higher sensitivity to increasing greenhouse gas emissions. Global temperatures have increased at a rate of 0.22 Fahrenheit per decade since 1951. But since 1998, the rate of warming has been only 0.09 F per decade - even as atmospheric carbon dioxide continues to rise at a rate similar to previous decades. Carbon dioxide is the most significant greenhouse gas generated by humans. Some recent research, aimed at fine-tuning long-term warming projections by taking this slowdown into account, suggested Earth may be less sensitive to greenhouse gas increases than previously thought. Additionally, airborne particles, called aerosols, have been found to drive climate change in the Northern Hemisphere. Depending on their make-up, some aerosols cause warming, while others create a cooling effect. In order to understand the role played by carbon dioxide emissions in global warming, it is necessary to account for the effects of atmospheric aerosols.

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November 27th, 2018

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