Under France's new energy policy, renewable energy will provide 32% of all energy by 2030.
Studies that evaluate cap-and-trade policies either ignore or greatly understate the potential advances in energy efficiency.
The Senate Environment and Public Works Committee has pushed back its deadline for drafting a climate change bill.
Senate bill would give the Commodity Futures Trading Commission (CFTC) full authority over a U.S carbon market.
Senate Majority Leader Reid has set a September deadline for a combined climate and energy bill.