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Subject:  Re: Arctic Ice Date:  2/25/2014  7:13 PM
Author:  warrl Number:  445530 of 538693

And Shell gave us biofuels. How do biofuels slow the amounts of CO2 being put out into the atmosphere? We would still be burning oxygen etc....

Biofuels put CO2 into the atmosphere just like fossil fuels.

But the carbon in the fossil fuels came out of the atmosphere a long time ago, mostly when atmospheric CO2 was at the normal level. So putting it back into the atmosphere helps return the atmosphere to normal.

The carbon in biofuels came out of the modern CO2-depleted atmosphere. So putting it back into the atmosphere has no net effect.
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