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One in five Americans has a criminal record, according to some estimates. And while punishment is usually temporary, those records can last forever. With an already stiff job climate, finding employment can be even tougher for those millions with unlawful pasts.

Renewable energy has become a $220 billion a year industry. But to significantly slow climate change, the power of wind, solar and other renewable sources must vastly expand. Some say the tech breakthroughs needed are on the horizon, though a top economist sees a tougher road ahead.

The smoke from nearly 100 large Western wildfires has public health officials worried. Air quality managers are warning this is the new norm for the region, given climate change.

The federal agency that regulates what happens on, and in, the oceans is making some major policy changes, including some tweaks to its mission statement.…

Astrophysicist Adam Frank has a cheat sheet for how to not get overwhelmed or snookered by science headlines.

The Doomsday Clock has inched closer to and farther from nuclear Armageddon since the Manhattan Project in 1947. On Thursday, the clock moved closer to Midnight — the closest it has been since 1954.

President Trump will have his first meeting as president with Russian President Putin. It will take place Friday at the G-20 summit in Germany.

A much-discussed awkward moment at the Notre Dame Cathedral didn't stop the two leaders from grasping each other in an epic handshake Friday.

The guests offer a snapshot of the political messages that each party is hoping to highlight Tuesday. For Trump, the focus is on national security and law enforcement. For Democrats, it's immigration.

Researchers took temperature readings in Nairobi's biggest slum during the summer and compared it to readings from a weather station half a mile away. There definitely was a difference.