Carbon Positive: A proposed US Senate compromise bill on climate and energy, months in the drafting, has finally been revealed in Washington, but its chances of passing this year are narrow. Democrat Senator John Kerry unveiled the American Power Act (APA) along with co-sponsor and independent Senator Joe Lieberman in Washington on Wednesday. The Kerry-Lieberman bill’s main thrust on reducing greenhouse emissions is much as had been expected – an emissions cap and trade scheme imposed on electricity …