The US state of California sued five of the world's largest oil companies on Friday, alleging the firms caused billions of dollars in damages and misled the public by minimizing the risks from fossil fuels, according to a court filing.- 'Watershed moment' - Activists said it was a "watershed moment" in the pushback against oil companies, with the Center for Climate Integrity noting that California "is now the world's largest economy and the first major oil-producing state to take fossil fuel com