This post was originally published at earthpolicy.org. ----- Community opposition, legal challenges, and financial uncertainty over future carbon costs are prompting companies to rethink their plans for coal. Since the beginning of 2007, 95 proposed coal-fired power plants have been canceled or postponed in the United States -- 59 in 2007, 24 in 2008, and at least 12 in the first three months of 2009. This covers nearly half of the 200 or so U.S. coal-fired power plants that have been proposed for construction since 2000. The vast majority of the remaining proposals are essentially on hold, awaiting word on …