Reuters: The United States needs to take the lead in preserving tropical forests in the fight against climate change, a coalition of lawmakers, corporate chiefs and environmentalists said on Monday. Deforestation accounts for 20 percent of the carbon emissions that spur global warming, members of the Avoided Deforestation Partners coalition told a Capitol Hill forum. The U.S. Congress is expected to take up legislation this year — possibly as soon as this month — to tackle climate …