Are we heating the planet directly?

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Are we heating the planet directly?
« on: 09/07/2010 16:30:02 »
stephen asked the Naked Scientists:
Firstly, your show is very good.

My question is, are we not cooking the planet by the fact that every engine that is running by fossil fuel, including electrical energy, is prouducing heat? Also what is the pecentage of oxygen in the atmosphere now. When I went to school it was approx. 21 percent.

Thank you for your show.

What do you think?
« Last Edit: 09/07/2010 16:30:02 by _system »