Here are the 10 Senate Democrats that voted to build Keystone XL.

Racism is the key to the high rate of imprisonment in the US. It offered the US a way to reconcile the push to "get tough" on criminals with the majority's wish not to be treated that way.

Human impact on ocean life is ramping up, paving the way for extinctions that could drastically modify ocean ecosystems and cause a cascade of extinctions.

Unrestrained capitalism is rolling steadily towards global disaster.

A fairly small spill of diesel fuel has left Longueuil, Canada, with undrinkable water.

Mauritania has arrested anti-slavery activists.