This thread was opened by Jontenoy in the wrong category. I wanted to move it here, but accidentally removed it. Fortunately it was still in my cache. Here's Jontenoy's text:
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Most discussions seem to be about reducing emissions. This is all fine except it is not going to happen fast enough. I think a possible solution would be to develop a vegetable with the following attributes :
* Has deep roots
* Produces food (grains, leaves, stalks etc)
* Keeps growing downwards
* Spreads rapidly
This would produce a vast tangle of treadlike roots which would capture and store carbon. If it died, a new plant could continue and grow around the old roots. Clover fixes Nitrogen. This would fix Carbon in the soil as biomass. Some grape vines and Olive trees have roots greater than 40 metres deep.
The same idea could be considered for the ocean whereby algae would form, reproduce and die on a continuous basis.