Exxon Mobil Corp on Tuesday scored a win in a closely-watched case after a judge ruled that the company did not hide the true cost of climate change regulation from investors.

The case, brought by the New York Attorney General, is one of dozens of lawsuits in the United States brought against oil companies by local and state governments over global warming. Justice Barry Ostrager said that the state had failed to prove investors were misled.

The following is a summary of how climate change litigation is playing out across the country:

* Exxon was the first case to go to trial against a major oil company over climate change.

* The New York attorney general had accused the Texas-based company of using two sets of books to hide the true cost of climate change from investors.