Without reliable, publicly available knowledge about Arctic oil’s scientific specifications, we cannot realistically assess the hazards of Arctic resource development.

As urban populations surge worldwide, cities must work together with national governments to create environmentally and financially sustainable urban transport systems.

Washington and Beijing should take their bilateral cooperation on climate change to the next level by implementing projects to help cities reduce their carbon emissions.

Rising sea levels threaten some of the world's largest megacities. With billions of dollars and the security of millions of people at risk, the time to act is now.