Environment

Updated at 4 p.m. ET

Nearly all of the seats on the U.S. National Park Service advisory board are vacant following a mass resignation Monday night, with ex-members citing Interior Secretary Ryan Zinke's unwillingness to meet with them.

This year, trucks and other heavy-duty motors in America will burn some 3 billion gallons of diesel fuel that's made primarily from vegetable oil. They're doing it, though, not because it's cheaper or better, but because they're required to, by law.

The law is the Renewable Fuel Standard, or RFS. For some, especially Midwestern farmers, it's the key to creating clean energy from American soil and sun. For others — like many economists — it's a wasteful misuse of resources.

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A new study suggests that the polar jet stream has been fluctuating more than normal as it passes over the parts of the Northern Hemisphere, and that's affecting weather in Europe and North America.

Search and rescue efforts continue in Santa Barbara County, Calif., after deadly mudslides killed at least 17 people and destroyed dozens of homes.

Flash floods swept down hillsides recently devastated by wildfires, highlighting the heightened risk of mudslides after firefighters contained the flames. Officials say 43 people are still missing, and experts are warning that more rainfall could cause more destruction.

Part 1 of the TED Radio Hour episode The Big Five.

About Tim Kruger's TED Talk

To tackle climate change, geoengineer Tim Kruger is developing technology that could remove large quantities of CO2 from the atmosphere. But he says it takes unprecedented cooperation to make it work.

About Tim Kruger

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