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Posted: 6/16/2013 6:58:12 AM EST
FILE - A gardener works in a show garden 'RBC Blue Water Roof Garden', designed by Nigel Dunnett and The Landscape Agency, during the Chelsea Flower Show in London on Monday, May 20, 2013. Environmentally conscious Londoners have made plans to battle some of the predicted effects of global warming by promoting better water management, expanding the city's Victorian sewage network, and “urban greening” - the process of planting trees and rooftop gardens to help managing the heat island effect common to urban areas. (AP Photo/Sang Tan, File)
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Posted: 6/16/2013 6:58:12 AM EST
FILE - A gardener works in a show garden 'RBC Blue Water Roof Garden', designed by Nigel Dunnett and The Landscape Agency, during the Chelsea Flower Show in London on Monday, May 20, 2013. Environmentally conscious Londoners have made plans to battle some of the predicted effects of global warming by promoting better water management, expanding the city's Victorian sewage network, and “urban greening” - the process of planting trees and rooftop gardens to help managing the heat island effect common to urban areas. (AP Photo/Sang Tan, File)
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Posted: 6/15/2013 9:19:16 AM EST
FILE - This May 10, 2013 file photo shows view of the Manhattan Bridge, left, and Brooklyn Bridge as seen from the 105th floor of One World Trade Center, in New York. Seven months after Superstorm Sandy swamped New York, Mayor Michael Bloomberg proposed a nearly $20 billion plan Tuesday, June 11, 2013, to protect the city from the effects of global warming and storms. (AP photo/Mark Lennihan, File)
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Posted: 6/15/2013 9:19:16 AM EST
FILE - This May 10, 2013 file photo shows view of the Manhattan Bridge, left, and Brooklyn Bridge as seen from the 105th floor of One World Trade Center, in New York. Seven months after Superstorm Sandy swamped New York, Mayor Michael Bloomberg proposed a nearly $20 billion plan Tuesday, June 11, 2013, to protect the city from the effects of global warming and storms. (AP photo/Mark Lennihan, File)
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Posted: 6/15/2013 9:13:43 AM EST
FILE - This May 10, 2013 file photo shows view of the Manhattan Bridge, left, and Brooklyn Bridge as seen from the 105th floor of One World Trade Center, in New York. Seven months after Superstorm Sandy swamped New York, Mayor Michael Bloomberg proposed a nearly $20 billion plan Tuesday, June 11, 2013, to protect the city from the effects of global warming and storms. (AP photo/Mark Lennihan, File)
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Posted: 6/15/2013 9:13:43 AM EST
FILE - This May 10, 2013 file photo shows view of the Manhattan Bridge, left, and Brooklyn Bridge as seen from the 105th floor of One World Trade Center, in New York. Seven months after Superstorm Sandy swamped New York, Mayor Michael Bloomberg proposed a nearly $20 billion plan Tuesday, June 11, 2013, to protect the city from the effects of global warming and storms. (AP photo/Mark Lennihan, File)
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Posted: 6/12/2013 6:42:02 AM EST
Pedestrians looks across the East River at the lower Manhattan skyline in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/12/2013 6:42:02 AM EST
Pedestrians looks across the East River at the lower Manhattan skyline in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/12/2013 6:42:02 AM EST
Pedestrians looks across the East River at the lower Manhattan skyline in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/12/2013 6:42:02 AM EST
Pedestrians looks across the East River at the lower Manhattan skyline in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/11/2013 7:42:24 PM EST
The skyline of lower Manhattan in seen past the East River in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/11/2013 7:42:24 PM EST
The skyline of lower Manhattan in seen past the East River in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/11/2013 7:42:24 PM EST
The skyline of lower Manhattan in seen past the East River in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/11/2013 7:42:24 PM EST
The skyline of lower Manhattan in seen past the East River in New York, Tuesday, June 11, 2013. The projections paint an unsettling picture of New York's future: a city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there could be as many 90-degree days as is now normal for Birmingham, Ala. Facing those new projections of the effects of global warming on the nation's biggest city, Mayor Michael Bloomberg talked Tuesday about what to do about risks that Superstorm Sandy brought into stark relief. (AP Photo/Seth Wenig)
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Posted: 6/11/2013 7:42:23 PM EST
FILE - This file photo of May 10, 2013 shows view of the Manhattan Bridge, left, and Brooklyn Bridge as seen from the 105th floor of One World Trade Center, in New York. Seven months after Superstorm Sandy swamped New York, Mayor Michael Bloomberg proposed a nearly $20 billion plan Tuesday, June 11, 2013, to protect the city from the effects of global warming and storms. (AP photo/Mark Lennihan, File)
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Posted: 6/11/2013 7:42:23 PM EST
FILE - This file photo of May 10, 2013 shows view of the Manhattan Bridge, left, and Brooklyn Bridge as seen from the 105th floor of One World Trade Center, in New York. Seven months after Superstorm Sandy swamped New York, Mayor Michael Bloomberg proposed a nearly $20 billion plan Tuesday, June 11, 2013, to protect the city from the effects of global warming and storms. (AP photo/Mark Lennihan, File)
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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)
