PBS NewsHour

NASA Study Links Extreme Summer Heat to Climate Change

Clip: 08/06/2012 | 5m 24s

A new statistical analysis from NASA reveals that the extreme summer heat felt by many Americans this year is the result of global warming. Hari Sreenivasan talks to Columbia University's James Hansen who says the greatest barrier to public recognition of human-made climate change is the natural variability of local climate.

Aired: 08/06/12

Rating: NR

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