ClimateBiz: Washington Gov. Christine Gregoire has proposed legislation that would enable the state to participate in a regional greenhouse gas (GHG) cap-and-trade system in 2012. But the details of how the system would work — including the contentious issues of offsets and whether emissions credits will be auctioned or freely allocated — are left to an as-yet unnamed panel to decide. By the time these hard decisions are made, a federal program may or may not be in place, which may or may not …