About James Hansen
James Edward Hansen is an American climatologist. He is an adjunct professor directing the Program on Climate Science, Awareness and Solutions at Columbia University. He is best known for his research in climatology, his 1988 Congressional testimony on climate change that helped raise broad awareness of global warming, and his advocacy of action to avoid dangerous climate change. In recent years, he has become a climate activist to mitigate the effects of global warming, on a few occasions leading to his arrest.
![“If humanity wishes to preserve a planet similar to that on which civilisation developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO₂ will need to be reduced from its current 385 ppm [parts per million] to at most 350 ppm... If the present…” quote by James Hansen](https://sms4smile.com/quotes/i/4b3/james-hansen-7143_adapted_if-humanity-wishes-to-preserve-a-planet_1183760.jpg)
![“Our analysis shows that, for the extreme hot weather of the recent past, there is virtually no explanation other than climate change. The deadly European heat wave of 2003, the fiery Russian heat wave of 2010 and catastrophic droughts in Texas and Oklahoma last year [2011] can each be attributed…” quote by James Hansen](https://sms4smile.com/quotes/i/9f5/james-hansen-7143_analysis_our-analysis-shows-that-for-the-extreme_1947281.jpg)
![“Imagine a giant asteroid on a direct collision course with Earth. That is the equivalent of what we face now [with climate change], yet we dither.” quote by James Hansen](https://sms4smile.com/quotes/i/ca3/james-hansen-7143_asteroid_imagine-a-giant-asteroid-on-a-direct-col_643017.jpg)