See how six countries are faring amid efforts to protect 30 percent of the planet’s land and waters by 2030, and what will be saved if they succeed. 

The connection between the rise of social media and the decline of American politics and society seems obvious. But what if what everybody knows is wrong? 

It is only natural to look for historical patterns and seek guidance from the past. But it turns out that not only is the past itself in dispute, the whole notion of historical patterns is a mirage. …

Fifty years ago, Republicans turned on President Richard Nixon. Today, most of the party continues to stand by Trump. Why the difference? A rise in partisanship.

The problem of fake news has been with us from the beginning of the Republic, and American democracy was even worse at dealing with it then than it is now.

The ratings agency’s decision will have no consequences for the U.S. dollar’s global role, but it highlights the country’s darkening fiscal outlook and governance challenges.