Climate Scientists Warn Opportunity to Prevent Dangerous Warming Is Dwindling | PBS NewsHour | Sept. 27, 2013 | PBS
MICHAEL OPPENHEIMER: These terms are used with great precision.Microsoft Word - WG1AR5-SPM_Approved27Sep2013.pdf
They're defined very carefully in the report, so that very likely means better than a 90 percent chance, and extremely likely means better than a 95 percent chance. And so this isn't casual language. This means the scientists looked at the problem carefully and decided that the case is ironclad. And that's all up and down this issue.
There's a big central focus on this issue on many facts, that the Earth is warming, that the warming will continue, that the dangerous warming is coming close, and that if we don't do something about emissions, we will be there pretty soon.
All of that is now known with a -- there's a consensus about all of that. Scientists are very careful. Scientists tend to be skeptical, of course, and here we have thousands of them getting together and being able to agree on this high level of certainty.
There is no environmental problem that is characterized by that level of certainty.
[I count 34 drafting authors and 37 contributing authors]