I read an article in Forbes about this company called Planktos whose idea is to dump iron dust into the ocean to cause phytoplankton to bloom and suck carbon dioxide out of the atmosphere. Also read an article about this company that is building a diesel rotary engine. Apparently it's much simpler than a piston engine and gets much better efficiency - 51 mpg.
Read an interesting article a couple weeks back in the WSJ on how biofuels may actually increase carbon emissions in the medium to long-term. Apprently the shifts in land-use necessary to support the production of bio-materials like soybeans, corn, or palm could in fact release more carbon emissions. The time it takes to get carbon-neutral on some of these projects is pretty crazy - 319 years for soybean biodiesel from Brazil (assuming you're clearing rainforest), 93 years for corn ethanol from the U.S. (assuming you're clearing grasslands), 86 years for palm biodiesel from Indonesia (assuming you're clearing rainforest). I suppose biofuels really aren't meant to reduce carbon emissions, but just crazy that they potentially exacerbate the problem so much.
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