World has entered new CO2 'danger zone', UN says

The world has entered a "new danger zone" with levels of Earth-warming carbon dioxide in the atmosphere never experienced by humankind, the UN's climate chief warned Monday.

Going vertical: Fleeing tsunamis by moving up, not out

(PhysOrg.com) -- In the minutes after a strong earthquake struck offshore of the Indonesian city of Padang on Sept. 30, fears of a tsunami prompted hundreds of thousands of residents to evacuate the coastal city. Or try to.

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