Here's a longer more informative article by
NYT
Years Later, Climatologist Renews His Call for Action
$this->bbcode_second_pass_quote('', 'T')wenty years ago Monday, James E. Hansen, a climate scientist at NASA, shook Washington and the world by telling a sweating crowd at a Senate hearing during a stifling heat wave that he was “99 percent” certain that humans were already warming the climate.
“The greenhouse effect has been detected, and it is changing our climate now,” Dr. Hansen said then, referring to a recent string of warm years and the accumulating blanket of heat-trapping carbon dioxide and other gases emitted mainly by burning fossil fuels and forests.
On Monday, Dr. Hansen, 67, plans to testify at a House committee hearing that it is almost, but not quite, too late to start defusing what he calls the “global warming time bomb.” He will offer a plan for cuts in emissions and also a warning about the risks of further inaction.
“If we don’t begin to reduce greenhouse gas emissions in the next several years, and really on a very different course, then we are in trouble,” Dr. Hansen said Friday at NASA’s Goddard Institute for Space Studies in New York, which he has directed since 1981. “Then the ice sheets are in trouble. Many species on the planet are in trouble.”
Dr. Hansen said the United States must begin a sustained effort to exploit new energy sources and phase out unfettered burning of finite fossil fuels, starting with a moratorium on the construction of coal-burning power plants if they lack systems for capturing and burying carbon dioxide. Such systems exist but have not been tested at anywhere near the scale required to blunt emissions. Ultimately he is seeking a worldwide end to emissions from coal burning by 2030.
Another vital component, Dr. Hansen said, is a nationwide grid for distributing and storing electricity in ways that could accommodate large-scale use of renewable, but intermittent, energy sources like wind turbines and solar-powered generators.
The transformation would require new technology as well as new policies, particularly legislation promoting investments and practices that steadily reduce emissions.
Such an enterprise would be on the scale of past ambitious national initiatives, Dr. Hansen said, like the construction of the federal highway system and the Apollo space program.
Dr. Hansen said he had no regrets about stepping into the realm of policy, despite much criticism.
“I only regret that we haven’t gotten the story across as well as it needs to be,” he said. “And I think we’re running out of time.”