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Blackstone to Banks: We Don't Need You   When Numbers are Hard to Read
Feb 27 2008 4:54PM EST

Small Feet, Large Footprints

Tyler Cowen explains why those of us without children should be less worried about our carbon footprint:

Your net carbon impact depends far more on the number of children you will have than any other variable; remember good environmentalism uses a zero rate of discount. So people with no biological children should be allowed to fly a lot and people with lots of biological children should not get to fly so much at all.

Does this mean the most environmentally unfriendly thing that any man can do is to donate to a sperm bank?

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