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Posted: 5/10/2013 4:50:56 PM EST
In this Sunday, Dec. 2, 2012 photo, a flock of Geese fly past the smokestacks at the Jeffrey Energy Center coal power plant as the suns sets near Emmett, Kan. Worldwide levels of the chief greenhouse gas that causes global warming have hit a milestone, reaching an amount never before encountered by humans, federal scientists said Friday, May 10, 2013. Carbon dioxide was measured at 400 parts per million at the oldest monitoring station in Hawaii which sets the global benchmark. The last time the worldwide carbon level was probably that high was about 2 million years ago, said Pieter Tans of the National Oceanic and Atmospheric Administration. (AP Photo/Charlie Riedel)
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Posted: 5/10/2013 4:50:56 PM EST
In this Sunday, Dec. 2, 2012 photo, a flock of Geese fly past the smokestacks at the Jeffrey Energy Center coal power plant as the suns sets near Emmett, Kan. Worldwide levels of the chief greenhouse gas that causes global warming have hit a milestone, reaching an amount never before encountered by humans, federal scientists said Friday, May 10, 2013. Carbon dioxide was measured at 400 parts per million at the oldest monitoring station in Hawaii which sets the global benchmark. The last time the worldwide carbon level was probably that high was about 2 million years ago, said Pieter Tans of the National Oceanic and Atmospheric Administration. (AP Photo/Charlie Riedel)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - This May 25, 2011 file photo shows damage following a tornado near Piedmont, Okla. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/The Oklahoman, David McDaniel, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - This May 25, 2011 file photo shows damage following a tornado near Piedmont, Okla. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/The Oklahoman, David McDaniel, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - In this May 24, 2011 file photo, a half-mile-wide tornado moves towards Piedmont, Okla. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/The Oklahoman, Paul Southerland, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - In this May 24, 2011 file photo, a half-mile-wide tornado moves towards Piedmont, Okla. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/The Oklahoman, Paul Southerland, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - In this May 22, 2011 file photo, emergency personnel walk through a severely damaged neighborhood after a tornado hit Joplin, Mo. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/Mark Schiefelbein, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - In this May 22, 2011 file photo, emergency personnel walk through a severely damaged neighborhood after a tornado hit Joplin, Mo. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/Mark Schiefelbein, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - This May 24, 2011 file photo shows the path of a powerful tornado through Joplin, Mo. In 2011, the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/Charlie Riedel, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - This May 24, 2011 file photo shows the path of a powerful tornado through Joplin, Mo. In 2011, the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/Charlie Riedel, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - In this May 22, 2011 file photo, a man carries a young girl who was rescued after a tornado hit Joplin, Mo. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/Mike Gullett, File)
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Posted: 3/15/2013 2:53:32 PM EST
FILE - In this May 22, 2011 file photo, a man carries a young girl who was rescued after a tornado hit Joplin, Mo. In 2011 the United States saw one of the busiest tornado seasons in generations: Nearly 1,700 tornadoes that killed 553 people. With the planet heating up, many scientists seem fairly certain some weather elements like hurricanes and droughts will worsen. But as the traditional season nears, scientists are still trying to figure out if there be more or fewer tornadoes as global warming increases. (AP Photo/Mike Gullett, File)
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Posted: 3/15/2013 11:38:29 AM EST
FILE - In this Aug. 7, 2011 file photo, Somali refugees herd their goats at the Ifo refugee camp outside Dadaab, eastern Kenya, 100 kilometers (62 miles) from the Somali border. Human-induced climate change contributed to low rain levels in East Africa in 2011, making global warming one of the causes of Somalia's famine and the tens of thousands of deaths that followed, a new study has found. (AP Photo/Jerome Delay, File)
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Posted: 3/15/2013 11:38:29 AM EST
FILE - In this Aug. 7, 2011 file photo, Somali refugees herd their goats at the Ifo refugee camp outside Dadaab, eastern Kenya, 100 kilometers (62 miles) from the Somali border. Human-induced climate change contributed to low rain levels in East Africa in 2011, making global warming one of the causes of Somalia's famine and the tens of thousands of deaths that followed, a new study has found. (AP Photo/Jerome Delay, File)
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Posted: 3/15/2013 11:38:29 AM EST
FILE - In this Aug. 5, 2011 file photo, newly arrived Somali refugees wait outside a UNHCR processing center at the Ifo refugee camp outside Dadaab, eastern Kenya, 100 kilometers (62 miles) from the Somali border. Human-induced climate change contributed to low rain levels in East Africa in 2011, making global warming one of the causes of Somalia's famine and the tens of thousands of deaths that followed, a new study has found. (AP Photo/Jerome Delay, File)
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Posted: 3/15/2013 11:38:29 AM EST
FILE - In this Aug. 5, 2011 file photo, newly arrived Somali refugees wait outside a UNHCR processing center at the Ifo refugee camp outside Dadaab, eastern Kenya, 100 kilometers (62 miles) from the Somali border. Human-induced climate change contributed to low rain levels in East Africa in 2011, making global warming one of the causes of Somalia's famine and the tens of thousands of deaths that followed, a new study has found. (AP Photo/Jerome Delay, File)
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Posted: 3/15/2013 11:38:29 AM EST
FILE - In this July 26, 2011 file photo, then seven month old Somali boy Minhaj Gedi Farah is treated in a field hospital of the International Rescue Committee (IRC) in Dadaab, Kenya. Human-induced climate change contributed to low rain levels in East Africa in 2011, making global warming one of the causes of Somalia's famine and the tens of thousands of deaths that followed, a new study has found. (AP Photo/Schalk van Zuydam, File)
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Posted: 3/15/2013 11:38:29 AM EST
FILE - In this July 26, 2011 file photo, then seven month old Somali boy Minhaj Gedi Farah is treated in a field hospital of the International Rescue Committee (IRC) in Dadaab, Kenya. Human-induced climate change contributed to low rain levels in East Africa in 2011, making global warming one of the causes of Somalia's famine and the tens of thousands of deaths that followed, a new study has found. (AP Photo/Schalk van Zuydam, File)
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Posted: 3/7/2013 5:08:42 PM EST
FILE - In this Aug. 29, 1938 file photo, smoke rises from smokestacks at Skoda’s main foundry in Pilsen, Czechoslovakia. A new study looking at 11,000 years of climate temperatures shows the world in the middle of a dramatic U-turn, lurching from near-record cooling to a heat spike. It shows how the globe for several thousands of years was cooling until an unprecedented reversal in the 20th century, which scientists say is further evidence that global warming isn’t natural but man-made since the start of the Industrial Revolution. The research was released Thursday, March 7, 2013 in the journal Science. (AP Photo)
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Posted: 3/7/2013 5:08:42 PM EST
FILE - In this Aug. 29, 1938 file photo, smoke rises from smokestacks at Skoda’s main foundry in Pilsen, Czechoslovakia. A new study looking at 11,000 years of climate temperatures shows the world in the middle of a dramatic U-turn, lurching from near-record cooling to a heat spike. It shows how the globe for several thousands of years was cooling until an unprecedented reversal in the 20th century, which scientists say is further evidence that global warming isn’t natural but man-made since the start of the Industrial Revolution. The research was released Thursday, March 7, 2013 in the journal Science. (AP Photo)
