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Conservationists have long blamed farmers' use of pesticides for decimating the milkweed that monarch caterpillars like to eat. But scientists say simply planting more milkweed isn't the answer.

John Daniszewski from the Associated Press, Margaret Sullivan from The Washington Post and Elizabeth Spayd from The New York Times discuss the media's roll in covering this political climate.

Whether Trump ultimately follows his team of hotspurs or uses them as heat shields as he negotiates a new reality, he sees them all as serving his purpose — not the other way around.

The mayor of New York City wants you to see what an hour's, a day's, a year's worth of NYC's carbon dioxide emissions would look like — if you could see them. The gas is normally invisible. So he's made a video, and it ain't pretty. Why would the mayor do this? What's it look like? See for yourself.

One former anti-nuke activist says the world can't afford to dismiss nuclear power, if we're to rein in global warming. Nuclear plants provide a more reliable energy supply than wind or solar, he says, and without the high carbon emissions that fossil fuels produce.

As the level of carbon dioxide in the air rises because of human activity, scientists are trying to pin down how plants are affected. There's evidence that it's changing many important plants we eat.

The failure to repeal Obamacare led to a falling out between the White House and Senate leadership. Ailsa Chang talks to Hunter Bates, former chief of staff to Senate Majority Leader Mitch McConnell.

The tubers are essential to the country's economy and culture, but their quality keeps declining. Now, researchers have found a way to mass produce good seed yams — and it could save the industry.

Xinjiang has nearly 20,000 glaciers, half of China's total. They're all receding at a record pace — and will continue to melt, some scientists warn, even if global temperatures stop rising.

Critics of the U.S. refugee program say they want more control over who's coming to live in their towns. In Poughkeepsie, N.Y., the debate got ugly.