When we click “buy it now” to purchase, say, a coffee pot, we support a process that has 165,000 miles of trains, planes, boats and truck travel attached to it.

Just like us, trees can communicate, nurture one another and protect each other from danger.

Three of five American cats are overweight, but simple feeding and exercise strategies can restore a plump feline to jungle-cat sleekness.

Dedicated to improving their slice of the world, activists are energetically tackling problems that range from food waste in California to poor sanitation in Haiti to Alzheimer’s treatment in New York.