Qatari Emir, Sheikh Hamad bin Khalifa Al-Thani addresses the opening of the high-level segment of the annual U.N. climate talks involving environment ministers and climate officials from nearly 200 countries, in Doha, Qatar, Tuesday, Dec. 4, 2012. U.N. Secretary-General Ban Ki-moon has urged governments to speed up slow-moving talks to forge a joint response to global warming and warned that climate change was a "crisis, a threat to us all, our economies, our security and the well-being of our children." (AP Photo/Osama Faisal)
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