Obama rejects Keystone XL oil pipeline

You can't ignore this land shark (or the conversation about plastic in our oceans)

Why Oslo is saying no to cars in its city center

How VW's diesel scam was discovered

VW has nowhere to go but up

Here's how VW's diesel 'defeat devices' worked

Styrofoam-eating worms can fight plastic waste

Plastic trash, textile fibers found in seafood

Air pollution kills more than 3 million a year

Smog alert! See air pollution in real time

What are ghost nets?

Elephant seals are raising the mercury levels at this California beach