Deep in the Amazon, Indigenous women say they fear getting pregnant. Rivers that have been the lifeblood of their people now carry mercury from illegal gold mining, threatening the health of their ...

Half of the field in Riyadh, Saudi Arabia comes from the U.S. All four players have defined their year by evolving, on the court and off.

Many economists and business leaders are raising alarms about falling birthrates. But advocates for lower human populations say a less crowded world will be happier and more sustainable.