Here are some highlights:

Connect Big Oil to Big Tobacco

The participants, including several veterans of the tobacco wars, discussed a turning point in the fight against tobacco: the unearthing of industry documents that showed the industry had long been aware of the health risks of its products, and the enormous lengths to which the companies went to sow doubt about the science.

The Department of Justice won a victory against the industry in a case relying largely on the Racketeer Influenced and Corrupt Organizations Act, also known as RICO — despite the tobacco companies’ insistence that its public statements were protected under the First Amendment. Fraud, the judge noted, is not protected by the Constitution.

The 2012 report stated, “Similar documents may well exist in the vaults of the fossil fuel industry and their trade associations and front groups, and there are many possible approaches to unearthing them.”

It also said, “State attorneys general can also subpoena documents, raising the possibility that a single sympathetic state attorney general might have substantial success in bringing key internal documents to light.”

Since November, several attorneys general, beginning with Eric T. Schneiderman in New York, have sent extensive subpoenas to Exxon Mobil seeking internal documents related to climate change. The state attorneys general have said that while they consult widely in preparing an inquiry, the decision to proceed is based on the merits of the case alone.

Lamar Smith, a Republican from Texas who is chairman of the House Science Committee, has sent a letter to Mr. Schneiderman, citing the collaboration and resulting subpoenas as possible “abuse of prosecutorial discretion.”

Get the Companies Into Court

The group also discussed other strategies for lawsuits based on theories that included false advertising, libel suits brought by climate scientists who have been maligned by industry surrogates, and “atmospheric trust” litigation, which is now being pursued in many states by groups like Our Children’s Trust.