New Scientist: Dumping crop waste in the deep ocean could be one of the best ways to rein in global warming, say researchers who have weighed the pros and cons of a range of carbon-capture schemes. Up to 30% of the leaves and stalks that remain in fields after harvesting can be removed without causing erosion or damaging soil fertility, estimate Stuart Strand of the University of Washington and Gregory Benford of the University of California, Irvine. This residue normally decays and releases …