Exhibit 3 in the suit filed Tuesday showed a 1982 internal Exxon management memo that graphs projected global mean temperatures in response to increasing levels of carbon dioxide. Image courtesy Oakland City Attorney's Office.

Exhibit 3 in the suit filed Tuesday showed a 1982 internal Exxon management memo that graphs projected global mean temperatures in response to increasing levels of carbon dioxide. Image courtesy Oakland City Attorney's Office.

Oakland, San Francisco sue the country’s five largest oil and gas companies

City attorneys from Oakland and San Francisco are suing five of the largest oil and gas companies, alleging they knowingly contributed to global warming by producing and promoting the use of fossil fuels.

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