tipping point passed

“Today I testified to Congress about global warming, 20 years after my June 23, 1988 testimony, which alerted the public that global warming was underway. There are striking similarities between then and now, but one big difference. The difference is that now we have used up all slack in the schedule for actions needed to defuse the global warming time bomb.

The next president and Congress must define a course next year in which the United States exerts leadership commensurate with our responsibility for the present dangerous situation.

Otherwise it will become impractical to constrain atmospheric carbon dioxide, the greenhouse gas produced in burning fossil fuels, to a level that prevents the climate system from passing tipping points that lead to disastrous climate changes that spiral dynamically out of humanity’s control.”

Dr James Hansen, Twenty Years Later: Tipping Points Near on Global Warming, Huffington Post, 07/01/2008 , Updated May 25, 2011