Top climatologist launches new website with graphs and analysis
Hansen on why he became an activist: “Our planet is close to climate tipping points” and it is “clear that needed actions will happen only if the public, somehow, becomes forcefully involved.”
The nation’s leading — and most scientifically prescient — climatologist has a new website, Updating the Climate Science: What Path is the Real World Following? It “will present updated graphs and discussion of key quantities that help provide understanding of how climate change is developing and how effective or ineffective global actions are in affecting climate forcings and future climate change.”
He also has a new essay, “Activist”, for “J. Henry Fair’s upcoming book.” As an aside I simply can’t imagine why Fair titled his book, “The Day After Tomorrow,” the dreadful, scientifically inaccurate 2004 climate movie that many folks, like director James Cameron, actually say set back the cause of informing the public about climate science and the dangers of unrestricted greenhouse gas emissions.
I’ll excerpt the essay and repost some of the graphs below:
Sea level change for 1870-2001, based on tide gauge measurements, from Church J.A. and White N.J. “A 20th century acceleration in global sea-level rise” Geophys. Res. Lett. 2006; 33: L01602. University of Colorado data are shifted to have the same mean for 1993-2001 as Church and White. The trends were computed for 1870-1920, 1920-1975, 1975-2001 for Church and White data, and 1993 – mid November 2009 for University of Colorado data. Figure also available in PDF. (Last modified: 2010/07/30)
Hansen explains how he became an activist:
“How did you become an activist?” I was surprised by the question. I never considered myself an activist. I am a slow-paced taciturn scientist from the Midwest. Most of my relatives are pretty conservative. I can imagine attitudes at home toward “activists”.
I was about to protest the characterization – but I had been arrested, more than once. And I had testified in defense of others who had broken the law. Sure, we only meant to draw attention to problems of continued fossil fuel addiction. But weren’t there other ways to do that in a democracy? How had I been sucked into being an “activist?”
My grandchildren had a lot to do with it. It happened step-by-step. First, in 2004, I broke a 15-year self-imposed effort to stay out of the media. I gave a public lecture, backed by scientific papers, showing the need to slow greenhouse gas emissions – and I criticized the Bush administration for lack of appropriate policies. My grandchildren came into the talk only as props – holding 1-watt Christmas tree bulbs to help explain climate forcings.
Fourteen months later I gave another public talk – connecting the dots from global warming to policy implications to criticisms of the fossil fuel industry for promoting misinformation. This time my grandchildren provided rationalization for a talk likely to draw Administration ire: I explained that I did not want my children to look back and say “Opa understood what was happening, but he never made it clear.”
What had become clear was that our planet is close to climate tipping points. Ice is melting in the Arctic, on Greenland and Antarctica, and on mountain glaciers worldwide. Many species are stressed by environmental destruction and climate change. Continuing fossil fuel emissions, if unabated, will cause sea level rise and species extinction accelerating out of humanity’s control. Increasing atmospheric water vapor is already magnifying climate extremes, increasing overall precipitation, causing greater floods and stronger storms.
Stabilizing climate requires restoring our planet’s energy balance. The physics is straightforward. The effect of increasing carbon dioxide on Earth’s energy imbalance is confirmed by precise measurements of ocean heat gain. The principal implication is defined by the geophysics, by the size of fossil fuel reservoirs. Simply put, there is a limit on how much carbon dioxide we can pour into the atmosphere. We cannot burn all fossil fuels. Specifically, we must (1) phase out coal use rapidly, (2) leave tar sands in the ground, and (3) not go after the last drops of oil.
