James Hansen

James E. Hansen heads the NASA Goddard Institute for Space Studies in New York City. He has held this position since 1981. He is also an adjunct professor in the Department of Earth and Environmental Sciences at Columbia University.

After graduate school, Hansen continued his work with radiative transfer models and attempting to understand the Venusian atmosphere. This naturally led to the same computer codes being used to understand the Earth's atmosphere. He used these codes to study the effects that aerosols and trace gases have on the climate. Hansen has also contributed to the further understanding of the Earth's climate through the development and use of global climate models.

Hansen is best known for his research in the field of climatology, his testimony on climate change to congressional committees in 1988 that helped raise broad awareness of global warming, and his advocacy of action to limit the impacts of climate change.

In the wake of President Donald Trump’s announcement that he was withdrawing the United States from the international climate agreement, governors from over a dozen states immediately announced they would take climate action on their own.

There is much that governors and state legislators can do, but study after study finds that keeping existing nuclear plants—our largest and most reliable source of clean energy—operating is one of the most important and cost-effective ways to prevent carbon emissions from increasing.