Global Warming Twenty Years Later
My presentation today is exactly 20 years after my 23 June 1988 testimony to Congress, which alerted the public that global warming was underway. There are striking similarities between then and now, but one big difference.
| Author | James Hansen |
| Size | 73 kb |
| Download | http://www.columbia.edu/~jeh1/2008/TwentyYearsLater_20080623.pdf |
Again a wide gap has developed between what is understood about global warming by the relevant scientific community and what is known by policymakers and the public. Now, as then, frank assessment of scientific data yields conclusions that are shocking to the body politic. Now, as then, I can assert that these conclusions have a certainty exceeding 99 percent. The difference is that now we have used up all slack in the schedule for actions needed to defuse the global warming time bomb.
