This isn't turning into a global warming blog, but this technology is so cool I have to pass it along. A company called Calera is proposing to bubble the output of the Moss Landing natural gas fired power plant through water in order to reclaim the CO₂ as cement. It works by turning the CO₂ into carbonate, and combining it with the calcium and magnesium in sea water. Read more at Scientific American. I first came across this concept in Marshall Savage's The Millenial Project, Colonizing the Galaxy in Eight Easy Steps where he proposed the construction of cities floating at sea, constructed from seacrete. It's cool to see it being proposed as a method of carbon sequestration; in total natural gas powerplants output a serious amount of CO₂ every day.