The greatest danger hanging over our children and grandchildren is initiation of changes that will be irreversible on any time scale that humans can imagine.
James HansenI've tried to be a straight scientist doing the science and reporting it as best I can.
James HansenIt has become very difficult for anyone to argue that observed global warming is natural variability. We have good reason for being able to say that the world will be warmer by about a quarter of a degree in the next decade. It's the same reason we had 10 years ago when we said that the 1990s would be warmer than the 1980s: The planet is out of equilibrium.
James HansenWe are on the precipice of climate system tipping points beyond which there is no redemption.
James Hansen