Absolutely not, says Tyler Cowen, in this usefully contrarian column. He concludes thus:

So if you are both worried about climate change and considering starting a family, I say: Put aside the unhelpful mess of emotions some participants in this debate are trying to stir up. Instead, focus on how your decision might boost future innovation. As a bonus, you might find that one of the better approaches to climate change is actually pretty fun.

His basic point is that your kids (given that you’re thinking about the problem) are more likely to be part of the solution than of the problem.