Hansen, 72, wrote in an email that he was stepping down from the organization in order to spend more time on his campaign to cut carbon emissions. He first testified about the impending threat of climate change before Congress in 1988.
PBS NewsHour interviewed Hansen in August about how the extreme heat events of 2012 were connected to human activity and climate change.
Hansen and his team at Goddard began publishing climate models in 1981 that projected the influence of carbon dioxide on global warming. Hansen's models showed that the increase in greenhouse gases would have drastic consequences far earlier than previous studies suggested.
He has continued to publish studies and articles on the topic, including a paper in 2012 in which Hansen coined the term "climate dice" to explain how climate change increases the odds for weather disasters like droughts, hurricanes and heat waves.
Developing countries were being urged by civil society groups to reject “a bad deal” at the...
A major storm pummeled northern California with rain and snow on Thursday and threatened to cause...
A set of powerful storms that could rank among the strongest in decades will slam British...
