'Cap and Dividend' supporters plot strategy in D.C.

Tyson Slocum of Public Citizen -- one of the groups taking part -- cautioned that all the participants are not endorsing that plan per se, but adds  "there are a lot of folks who understand that it is a superior starting point in terms of a legislative solution." Other groups taking part include Clean Air Watch, 350.org, the Chesapeake Climate Action Network, NYPIRG and other state groups.

Cantwell's plan covers "upstream" sources of carbon dioxide (think oil producers and mining companies but not factories and power plants), provides 75 percent of the emissions auction proceeds to consumers, and the balance would go into a new trust fund for clean energy, aid for affected workers and other areas.

The meetings come amid questions about what approach lawmakers will take if the Senate brings up climate change legislation this year, which Majority Leader Harry ReidHarry ReidHillary's ObamaCare problem Sanders tests Wasserman Schultz Nearly 400 House bills stuck in Senate limbo MORE (D-Nev.) insists is on the 2010 agenda.

Many major green groups -- including the Sierra Club, Environmental Defense and the Natural Resources Defense Council -- backed the sweeping cap-and-trade and energy bill the House approved in June.

The plan sets a declining nationwide cap on heat-trapping emissions and allows polluters to buy and sell emissions permits from one another and other parties. Unlike the Cantwell plan, the bill -- at least initially -- allocates the bulk of the valuable emissions permits for free to various industries and programs, such as state renewable energy initiatives.

The bill steers large amounts of free allowances to utilities with the requirement that  they be used to hold down consumers' power bills.

Sen. John KerryJohn KerryFive things Clinton needs to do to win the California primary An all-female ticket? Not in 2016 GOP senator calls for China to crack down on illegal opioid MORE (D-Mass.) co-sponsored a similar bill in September. But Kerry and Sen. Lindsey GrahamLindsey GrahamSenators to Obama: Make 'timely' call on Afghan troops levels Senate amendments could sink email privacy compromise Trump: Romney 'walks like a penguin' MORE (R-S.C.) -- who along with Joe Lieberman (I-Conn.) are trying to craft a compromise Senate bill -- have since said that the structure of the Senate emissions-capping measure is in flux.