A bill to require big corporations to be transparent about their own carbon footprint needs a vote in the California Senate by the legislative deadline on Monday, or it will die. Senate Bill 260 would require U.S.-based corporations that do business in California and make more than $1 billion a year in revenue to disclose their full greenhouse-gas emissions to the state. Melissa Romero, legislative affairs manager at California Environmental Voters, said the data is necessary to fight global warming "because we can't really have a serious conversation about reducing carbon emissions without addressing the corporate sector's contributions to pollution - when just 100 companies are responsible for 71% of global industrial emissions." Senate Bill 260 has long lists of supporters and opponents. ...