John Hardly, you misrepresent what I have said on other threads.

The idea of a runaway greenhouse effect turning the earth into a second Venus (which suffered a runaway greenhouse effect millions of years ago) is not likely, but it is possible. Scientists—planetologist and climatologists in particular—say that this is the case, and what makes it especially cautionary is that we cannot be absolutely sure when we have crossed the "tipping point" where the process becomes irreversible.

It is a worst-case scenario. But ignoring the possibility might be a very dangerous thing to do.

Laugh at me all you like if it makes you feel good, but just remember, I'm quoting some pretty heavy-duty planetologists and climatologists here. This is not "science fiction." We are gradually learning that the balance of nature that permits life on earth at all is far more delicate than the scientifically uneducated believe or those with an ax to grind are willing to admit.

Don Firth