Why do carbon dioxide levels increase

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Climate Time Machine. Greenhouse gas levels surged in , NOAA says. Please enter email address to continue. Please enter valid email address to continue. Chrome Safari Continue. Be the first to know.

Less than two years later, in , the global amount went over ppm for the first time. If global energy demand continues to grow and to be met mostly with fossil fuels, atmospheric carbon dioxide is projected to exceed ppm by the end of this century. Carbon dioxide emissions by country over time. Comparing greenhouse gases by their global warming potential.

Collins, M. Knutti, J. Arblaster, J. Dufresne, T. Fichefet, P. Friedlingstein, X. Gao, W. Gutowski, T. Johns, G. Krinner, M. Shongwe, C. Tebaldi, A. Weaver and M. Qin, G. Plattner, M. Tignor, S. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex and P. Midgley eds.

Lan, B. Hall, G. Dutton, J. Le Floch, B. Bereiter, T. Blunier, J.