Carbon dioxide – our target gas? Here’s why: see this paper by Professor Pierrehumbert:

Here is a really important paper from one of the world’s supreme climate scientists, Professor Raymond Pierrehumbert of Chicago University. He explains how we must keep our eyes on carbon dioxide, rather than be waylaid by too much attention to the “other” greenhouse gases, especially methane.

Why is this important? Because this is a hydrogen website, where we demonstrate the superiority of hydrogen to all carbon dioxide emitting fossil fuels: the burning of hydrogen results in the emission of harmless water vapour, with absolutely no carbon component.

Short-Lived Climate Pollution

Annual Review of Earth and Planetary Sciences

Vol. 42: 341-379 (Volume publication date May 2014)
First published online as a Review in Advance on February 27, 2014
DOI: 10.1146/annurev-earth-060313-054843
R.T. Pierrehumbert
Department of the Geophysical Sciences, The University of Chicago, Chicago, Illinois 60637; email:

Although carbon dioxide emissions are by far the most important mediator of anthropogenic climate disruption, a number of shorter-lived substances with atmospheric lifetimes of under a few decades also contribute significantly to the radiative forcing that drives climate change. In recent years, the argument that early and aggressive mitigation of the emission of these substances or their precursors forms an essential part of any climate protection strategy has gained a considerable following. There is often an implication that such control can in some way make up for the current inaction on carbon dioxide emissions. The prime targets for mitigation, known collectively as short-lived climate pollution (SLCP), are methane, hydrofluo-rocarbons, black carbon, and ozone. A re-examination of the issues shows that the benefits of early SLCP mitigation have been greatly exaggerated, largely because of inadequacies in the methodologies used to compare the climate effects of short-lived substances with those of CO2, which causes nearly irreversible climate change persisting millennia after emissions cease. Eventual mitigation of SLCP can make a useful contribution to climate protection, but there is little to be gained by implementing SLCP mitigation before stringent carbon dioxide controls are in place and have caused annual emissions to approach zero. Any earlier implementation of SLCP mitigation that substitutes to any significant extent for carbon dioxide mitigation will lead to a climate irreversibly warmer than will a strategy with delayed SLCP mitigation. SLCP mitigation does not buy time for implementation of stringent controls on CO2 emissions.

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