Reservoirs, a major component of California’s water storage system, are a significant source of climate-warming emissions, releasing more greenhouse gases across the state than 300,000 gas-powered cars in a year, according to a report published today by the Center for Biological Diversity. Beneath the Surface outlines the environmental threats of big water infrastructure projects and exposes why reservoirs’ water storage benefits will only diminish as climate change intensifies. The report comes as California plans three massive reservoirs and dam expansion projects, including Sites Reservoir, that will cost a total of $7 billion. These and similar projects across the western U.S. would divert large quantities of water from nearby rivers and cause irreparable harm to imperiled fish and other wildlife.