I was emailed the following questions by an alarmist (under the cowardly anonymous name 'grhm332'). After checking his IP address to make sure he wasn't posting from a public government funded organization in work hours, I proceeded to check the questions were not a trap - ie were they designed to make me sound like an idiot when I answered them. Satisfied, I decided to respond.
Lets get something straight though - I don't believe in email, not in the sense that I don't believe in the Greenhouse Effect, I just mean I don't like it. I don't like email. Whenever I get an email, I will not respond directly. It's a security issue - the UN would just love to break into my email server and steal my climate emails. Instead I write a response up on a blog and then email the recipient a link to that blog post. Then they can come and comment on that blog post. I like it that way because then I can moderate them. Also it allows others to Peer-To-Peer review our discussion. And my blog visitor count goes up, which is the most important part of Blog Science.
The questions I was asked and my responses:
What Level Of CO2 Would You Consider Dangerous Enough To Act On?
I sense a trap here. The questioner wants me to answer that no level would be dangerous and make me sound like an idiot! Nice try, but it won't fly.
My answer is 2 million ppm - at which point I might start considering there may be a problem. At about 5 million ppm CO2 I think that would definitely be too much life even for skeptics.
How Much Global Warming Would You Consider Dangerous?
Well considering it's been quite cold here lately with lows dropping just below zero, and factoring in my tolerance for Saunas, I would have to say something like 60 degrees C global warming would probably be the danger limit. With one caveat - if 60 degrees C warming was caused by CO2 (even though it couldn't be) that wouldn't be dangerous because vegetables would grow bigger - good effect canceling out bad effect, etc.