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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.

Some progressives and women hoped Ivanka Trump would be a moderating force on her father. But, five months into his new administration, there is limited evidence that it's working out that way.

Nearly 90 percent of Kentucky's electricity is from coal — the cheap energy source that helped build its manufacturing economy. Now it's struggling to respond as more businesses want clean energy.

For queer students, the decision to go abroad can come with added questions. Without answers, some worry they may skip the experience altogether — and miss out on all the benefits.

Water scarcity and heat are threatening two of Switzerland's main agricultural products: milk and cheese. But the shortage affects far more than cows — Swiss glaciers also feed Europe's major rivers.

Ninety percent of the West is under drought. Concerns of another bad fire year come as one farming community in Washington state has barely started cleaning up from a destructive fire last year.