Y! Green: Sen. John Kerry (D-Mass.) and Sen. Joseph Lieberman (I-Conn.) will unveil their bipartisan climate and energy bill, the American Power Act, today without the support of Sen. Lindsey Graham (R-S.C.), who helped craft the bill but dropped his support earlier this month, at least for now. The bill would set the first nationwide limits on carbon pollution emitted from power plants and factories, through a cap-and-trade system that has worked to control other pollutants, like gases that …