1. suffocating

    Carbon Dioxide Highest in Human History

    Smoke rises from a chimney of a cogeneration plant in Beijing November 25, 2013.  China will launch two new pilot carbon trading schemes this week in Beijing and Shanghai as it strives to cut soaring rates of greenhouse gas, reduce choking smog and determine the best system for a nationwide roll-out.
REUTERS/Kim Kyung-Hoon (CHINA - Tags: ENERGY) - RTX15SCU

    Kim Kyung Hoon/Reuters

    The amount of carbon dioxide in Earth's atmosphere has reached the highest level in human history, exceeding 400 parts per million in April. Ice cores taken from Antarctica with air bubbles as old as 800,000 years has not revealed a level higher than 300 ppm. "If we fail to heed this warning, our children will end up living in a world that is much hotter than any human being has ever experienced," says scientist Ken Caldeira.

    Read it at SF Gate