Margaret Thatcher, Lyndon Johnson were Right!
President Lyndon Johnson and British Prime Minister Margaret Thatcher made stark warnings about global warming decades ago, but convincing evidence for action only amassed in recent years, experts say.
A 190-nation U.N. conference in Copenhagen in December is due to agree a new U.N. pact to curb greenhouse gas emissions to slow a rise in temperatures to prevent floods, droughts, wildfires or rising sea levels.
Scientists have known for a century that greenhouse gases, for instance from burning coal, can warm the planet. But most experts say the evidence was thin until about the past decade.
"I don't think it (the world reaction) was too slow -- I think we have a very solid foundation for action now," said Yvo de Boer, head of the U.N. Climate Change Secretariat. "The skeptics are no longer derailing the process."