This is the one mechanism that actually has the potential to turn the entire economy around without directly making politicians look bad, so it has a nonzero chance of passing.
The best thing you can do for the climate today is to call your representatives about this bill, or better, send handwritten letters or letters to the editor.
Try www.writegreen.org to write a personal letter to Congress in 4 minutes instead of two hours. Personal letters are 20x more effective than form letters.