He then became interested in the physics of transport in the stratosphere, in which mixing is relatively weak and parcels of air can be tracked for long periods of time.
As director of the Geophysical Fluid Dynamics Laboratory, he became involved in interpreting the results of computer models of global warming for the public and policymakers.
[7] On the topic of climate change before the U.S. Senate Committee on Commerce, Science, and Transportation on March 3, 2004, he said: Global warming is real and is a phenomenon that humans have created.
Climate scientists worldwide have understood its essence since the so-called "Charney Report" of the National Research Council 25 years ago.
Our burning of fossil fuels (coal, oil, and natural gas) is the indisputably direct cause of the ever-increasing concentrations of carbon dioxide in the atmosphere.