"An early version of Senate climate legislation obtained today by E&E confirms that Sens. Barbara Boxer (D-Calif.) and John Kerry (D-Mass.) largely plan to follow the path their Democratic colleagues pursued in the House-passed climate bill.
But the 684-page Senate draft bill (pdf) diverges from the House measure in its push for a 2020 emissions target of 20 percent, compared with the House's bill's 17 percent limit.
Both the House-passed bill, H.R. 2454 (pdf), and the preliminary Boxer-Kerry proposal contain the same longer-term emissions limits of 42 percent below 2005 levels by 2030 and an 83 percent cut for 2050."
Darren Samuelsohn and Ben Geman report for Greenwire in the New York Times September 29, 2009. 
"Senate Climate-Change Bill Would Cut Greenhouse Emissions 20% by 2020" (Los Angeles Times)