A group of young Americans are suing the U.S. government for the right to have a livable planet.

While we wait for politicians to act, it is important to concentrate our spare resources on effective aid that helps poor people lead the best lives they can.

Leaders who want to act humanely toward immigrants must go far enough toward stricter border control to undercut public support for far-right parties.

Despite the positive attitudes people have toward dogs and cats and other pets, many of these companion animals lead miserable lives.

His predictions have been falsified, his theories discredited and his ideas rendered obsolete. So why should we care about his legacy in the 21st century?

The illegality of the invasion of Iraq is directly relevant to official U.S. thinking on Iran and North Korea today.

Could the vehemence of the response to revelations of the carmaker's experiments on the effects of diesel exhaust indicate a tectonic shift in ethical attitudes toward animals?