CLIMATE LINK: Exxon studied the impact of fossil fuel emissions on global warming as far back as 1981, according to email from one of the firm’s own scientists. (InsideClimate News)

ALSO: California Gov. Jerry Brown told international leaders at a Toronto summit Wednesday that the world is on a collision course with fossil fuels. (Los Angeles Times)

GAS LINES: The U.S. Department of Transportation moved Wednesday to expand a requirement for utilities to install safety valves on natural gas lines to reduce risk of deadly explosions. (Associated Press)

CLIMATE PLAN: Senators sparred Wednesday over the effectiveness and legality of President Obama’s plans to reduce greenhouse gas emissions as part of an international climate agreement later this year. (The Hill)

OZONE: The House rejected a proposal on Wednesday to eliminate a provision in a GOP spending bill that would restrict the EPA’s ability to enforce air quality standards for ozone. (The Hill)

CRUDE EXPORTS: The House Agriculture Committee convened a hearing Wednesday to study how crude exports could affect rural America, but instead the panel called on oil industry leaders. (FuelFix)

WAVE ENERGY: For the first time in the U.S., energy collected from waves is being turned into electricity that is heading onto the grid and powering homes in Hawaii. (Popular Science)

WASTEWATER: California’s epic drought is pushing the oil-and-gas industry to address the billions of gallons of wastewater that gush out of wells every year. (Bloomberg)

EARTHQUAKES: Thousands of pages of emails and other documents show that the Oklahoma governor’s office moved slowly to address earthquakes tied to oil and gas production. (EnergyWire)

WIND: Facebook has broken ground on a $1 billion global data campus in north Fort Worth that will draw renewable power from a wind farm northwest of Dallas. (Dallas Business Journal)

NUCLEAR: Federal regulators have restarted the process of deciding whether California’s last nuclear power plant will remain open for decades. (San Francisco Chronicle)

MOVE: San Francisco-based solar energy software company Clean Power Finance opened a new office in Houston this week with plans to hire at least 100. (Houston Business Journal)

COAL: Tighter regulations, environmental lawsuits and a pivot toward cleaner-burning natural gas have left communities like Somerset, Colorado, struggling to find a future. (The New York Times)

RELIGION: Catholics and Muslims in the Midwest are pushing for clean energy and other climate-friendly measures. (Midwest Energy News)