A farmer tends to his blooming rape seed field in the hills above Burford in the Cotswolds on April 21, 2009 in Burford, United Kingdom. (Christopher Furlong/Getty Images) #

This undated handout photo provided by the journal Science shows Iron oxides staining the snout of the Taylor Glacier, in the McMurdo Dry Valleys, Antarctica, forming a feature commonly referred to as Blood Falls. The iron originates from ancient subglacial brine that episodically discharges to the surface. Outflow collected at Blood Falls provides access to a unique subglacial ecosystem that harbors a microbial consortium which actively cycles iron, sulfur and carbon for growth. (AP Photo/ Science, Benjamin Urmston) #

Sprinklers water a field at sunset on April 16, 2009 north of Buttonwillow, California. Central Valley farmers and farm workers are suffering through the third year of the worsening California drought with extreme water shortages and job losses. (David McNew/Getty Images) #

Local miner Cesar Abac uses a wooden bowl and mercury to pan for gold near at the village of Las Cristinas, southern Bolivar State, Venezuela on January 30, 2009. Four centuries after the lure of Venezuelan gold brought ruin to English explorer Sir Walter Raleigh, the riches at one giant mine some say is cursed still haunt treasure hunters from across the globe. But the Las Cristinas saga, involving a ghost town, environmental devastation and fist-sized nuggets, underlines the risks of business in Venezuela, where the draw of natural wealth has been dulled by rule changes and economic turmoil. (REUTERS/Henry Romero) #

This photo from 1997, released by Woods Hole Oceanographic Institution shows the robotic arm of a three-person submersible aquatic vehicle reaching toward a hydrothermal vent in the east Pacific Ocean far off the coast of Chile. New technology and worldwide demand for metals have combined to make deep ocean mining of the mineral-laden liquid spewed from these vents a possibility. (AP Photo/Woods Hole Oceanographic Institution, Pat Hickey) #

A humpback whale raises its tail as it prepares for a deep dive in the Santa Barbara Channel off the coast of Oxnard, Calif. on Sunday afternoon, April 19, 2009. The offshore oil platform “Gail” is seen in the background. (AP Photo/The Santa Barbara News-Press, Mike Eliason) #

Ferid Sinan, a 40-year-old Bosnian man, carries a bag of coal out of an illegal coal mine, where he lives and works, near the central Bosnian town of Kakanj,30 kms north of Sarajevo, on Friday, March 13, 2009 . Sinan lives and works in the improvised mine which he dug himself, collecting low quality coal with his hands and primitive tools to make a living earning less than 5 euros per bag. (AP Photo/Amel Emric) #

Sunrise in windy Langdon, North Dakota, where the Langdon Wind Energy Center can be found. The center produces 159 megawatts with over 100 turbines. (Essdras M Suarez/Globe staff) #

Workers stand by to mount a propeller as a crane lifts it to the top of a power-generating windmill turbine in the northern German city of Hamburg on March 20, 2009. This single turbine can produce 6 megawatts of energy and is the first of two new power-generating windmills, built in the harbour area of Hamburg. (REUTERS/Morris Mac Matzen) #

A silhouette of a single snow goose is seen as it flies beneath the moon at the Middle Creek Wildlife Management Area in Kleinefeltersville, Pa. Snow geese are on their spring migration north to their nesting habitats in arctic tundra regions. (AP Photo/Carolyn Kaster, File) #

Analyzing a variety of samples from the atmosphere above the Amazon, Ilan Koren and colleagues at the Weizmann Institute in Israel, show in the journal Science that smoke and other so-called “aerosol” particles can encourage or discourage cloud formation, depending on the conditions, and a their new scientific model shows how these two processes produce a joint effect on climate. (Science/AAAS) #

An Afghan man mines rock to make sand for use in construction in Kabul, Afghanistan on April 13, 2009. (REUTERS/Omar Sobhani) #

Snow-covered pine trees sit in flood water March 31, 2009 near Moorhead, Minnesota. A snowstorm had slowed recovery efforts as residents of Moorhead and neighboring Fargo, North Dakota returned to their homes as the Red River slowly receded. (Scott Olson/Getty Images) #

A North Dakota Air National Guard helicopter carries six 1,000-pound sandbags to the edge of the Clausen Springs dam Wednesday, April 15, 2009, as an attempt was being made to control the erosion of the emergency spillway. (AP Photo/ The Forum, Dave Wallis ) #

This undated photo provided by BrightSource Energy shows their Luz Power Tower in Israel’s Negev Desert (mirrors concentrate sunlight on the tower at center). BrightSource has proposed building three solar-energy generation complexes in the eastern Mojave Desert several miles from an old mining and railroad townsite called Ivanpah, Calif. A westward dash to power electricity-hungry cities by cashing in on the Mojave’s most abundant resource – sunshine – is clashing with efforts to protect species like the tiny pupfish and desert tortoise. (AP Photo/BrightSource, Eilon Paz) #

Solar panels stand in a field of flowers at Acciona SA’s solar power station in Amareleja, Portugal, on Tuesday, April 14, 2009. The 46-megawatt facility, has a production capacity of 93 million kilowatt-hours a year, and is the world’s biggest photovoltaic electricity plant. (Mario Proenca/Bloomberg News) #

An enormous iceberg, right, breaks off the Knox Coast in the Australian Antarctic Territory on Jan. 11, 2008. (AP Photo/Torsten Blackwood, Pool) #

An aerial photograph shows a wall being built by Rio de Janeiro city hall to limit the expansion of the Santa Marta slum and stop encroaching on the neighboring forest in Rio de Janeiro, Brazil on March 28, 2009. (REUTERS/Bruno Domingos) #

Stars in the night sky rotate above the distinctive chimney stack on the top of Cape Cornwall near St. Just on April 12, 2009 in Cornwall, England. The landmark, orginally built for the Cape Cornwall Mine in 1850 and was recently damaged when it was struck by lightning, was bought, along with the rest of Cape Cornwall, for the nation by Heinz in 1987 and given to the National Trust to mark Heinz’s centenary. (Matt Cardy/Getty Images) #

Minnows are deposited through a tube from a tanker truck into Lake Delton as area officials take the first steps in restocking the lake, Monday, April 20, 2009, in Lake Delton, Wisconsin. The minnows will serve as food for larger game fish to be stocked in June. A section of the manmade lake’s shore washed away during thunderstorms last June, and the entire lake drained through the opening. (AP Photo/Morry Gash) #

A Kenyan fisherman holds a fish that had escaped from his fishing net, Saturday, Feb. 28, 2009 in the waters of Diani on the Kenyan south coast. Plastic fishing nets, some bought for poor fishermen with American aid money, are tangling up whales and turtles on Diani, one of Africa’s most popular beaches. (AP Photo/Karel Prinsloo) #

A plant stands in front of piles of waste paper being shipped to mainland China for recycling, at a collection site in Hong Kong on Earth Day April 22, 2009. (REUTERS/Tyrone Siu) #

A bird flies past dumped plastic bottles and other garbage on the bank of the river Sava in Belgrade, Serbia on April 22, 2009. (ANDREJ ISAKOVIC/AFP/Getty Images) #

The Llaima volcano spews smoke and lava some 850 km (528 miles) south of Santiago, Chile in this January 2, 2008 photo. (REUTERS/Jose Luis Saavedra/File) #

Residents walk in debris after a dam burst in Jakarta, Indonesia, Sunday, March 29, 2009. Attention shifted to caring for homeless and hungry survivors after the dam burst outside the Indonesian capital, sending a wall of water crashing into homes and killing at least 91 people, and leaving more than 100 others missing.(AP Photo/Tatan Syuflana) #

A red-tailed hawk uses its talons to to grab a meal of Brazilian free-tailed bat as a cloud of the bats emerges from Frio Cave near Uvalde, Texas, during an evening hunt for insects. (Mark Wilson/Globe Staff) #

Work is underway at a new oil well seen Tuesday, April 21, 2009, in the Sakhir, Bahrain, desert oil fields of the Persian Gulf. (AP Photo/Hasan Jamali) #

Lebanese workers use water pressure to clean-up the oil spill which polluted Rabbit Island, offshore the Nothern Lebanese city of Tripoli, on March 31, 2009. The oil spill was caused by the explosion of fuel reservoirs stationed in the southern coastal town of Jiyyeh during the Israeli offensive on Lebanon in July 2006. (Georges Haddad/AFP/Getty Images) #

A farmer works on a drought-hit paddy field on the outskirts of Chongqing municipality March 24, 2009. China is unlikely to need significant wheat imports this year as the domestic harvest has thus far escaped damage from a major drought, Nie Zhenbang, director of the State Grain Administration, said. (REUTERS/Stringer) #

Tropical Cyclone Billy, off the coast of Western Australia on December 25, 2008. (NASA image by Jeff Schmaltz, MODIS Rapid Response Team, Goddard Space Flight Center) #

Dead carp are seen in the “Las Tres Pascualas” lagoon in Concepcion city, some 322 miles (519 km) south of Santiago, Chile on March 30, 2009. Environmentalists say a clandestine dumping of sewage in the lagoon led to the waters being polluted and caused the high rate of fish mortality, local authorities said. Picture taken March 30, 2009. (REUTERS/Jose Luis Saavedra) #

Russian Emergency Ministry staff watch a blast ripping through the ice covering the Kan river in the town of Kansk some 220 km (136.7 miles) from the Siberian city of Krasnoyarsk April 4, 2009. Explosive experts used dynamite to break the ice cover to ease pressure that could cause floods as melting snow increases the river’s water volume. (REUTERS/Ilya Naymushin) #

People watch a salamander cross a roadway in New Haven, Vt., Sunday, March 22, 2009. They volunteered on a recent night to carry salamanders, frogs and newts across the road during their annual migration to mate. On rainy nights in early spring, roads between forests and vernal pools are hopping and crawling with activity. On some nights, hundreds of amphibians cross small stretches of roads to mate, but many do not make it, being run over by cars. (AP Photo/Alden Pellett) #

Rescuers work to keep alive one of the 17 long-finned pilot whales that were being battered by rough seas after they were beached in Hamelin Bay, Western Australia on Monday, March 23, 2009. About 80 whales and dolphins were stranded on the remote southwest Australian beach where authorities tried to truck the few survivors to a protected bay before attempting to launch them back to sea. (AP Photo/Steve Mitchell) #

A Polish seasonal worker takes part in the asparagus harvest in a field near the eastern German town of Klaistow on April 13, 2009. Hundreds of seasonal workers travel to Germany every year from eastern European countries to help out with the asparagus harvest. (MICHAEL URBAN/AFP/Getty Images) #

Green glass bottles are piled up high over an area estimated to be the size of a soccer field, near a recycling plant in the southern Israeli town of Yeruham, Israel, Wednesday, March 25, 2009. The green bottles are from all types of bottles and are separated for recycle purposes near to the processing plant.(AP Photo/Oded Balilty) #

A male Asian Longhorned beetle, held up to the camera. A recent infestation of the Asian Longhorned beetle in central Massachusetts has mobilized forestry officials and lawmakers to rein it in. The beetles are wood-boring insects that attack a variety of native hardwood species, their larvae tunnel through the heartwood of a host tree until fully grown, then they burrow out of the trunk as an adult, weakening the wood. (Jennifer Forman Orth/Massachusetts Department of Agricultural Resources) #

Elang, an Indonesian student, swims in foamy, polluted waters after school, at the Pluit Dam in Jakarta, Indonesia on April 20, 2009. (REUTERS/Beawiharta) #

A wolf walks on an empty road in a forest inside the 30 km (18 mile) exclusion zone around the Chernobyl nuclear reactor near the village of Babchin, Belarus, some 370 km (217 miles) southeast of Minsk, February 2, 2009. Still inhospitable to humans, the Chernobyl “exclusion zone” is now a nature reserve and teems with wolves, moose, bison, wild boars and bears. (REUTERS/Vasily Fedosenko) #

Easter, 2009

Slovenian artist Franc Grom drills a hole in an empty egg shell in Vrhnika, Slovenia on April 9, 2009. Grom drills thousands of holes into egg shells to create unique Easter eggs of fragile beauty. (REUTERS/Srdjan Zivulovic)

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Slovenian artist Franc Grom displays his drilled Easter eggs in Vrhnika, Slovenia April 9, 2009. (REUTERS/Srdjan Zivulovic) #

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The Scituate Clergy Association organized an Easter service at the lighthouse at sunrise in Scituate, MA on Sunday, April 12, 2009. After the service, the sun shined down above the horizon. (Yoon S. Byun/Globe Staff) #

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A man and child receive a hot meal during the annual Good Friday Easter event at the Los Angeles Mission on Good Friday, April 10, 2009 in Los Angeles, California. Nurses and Volunteers provided Easter baskets and toys to homeless children, including some 3,000 hot meals, 2,000 pairs of shoes and podiatric care for the homeless of Central City East in Los Angeles. (David McNew/Getty Images) #

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Traditionally hand painted eggs for Easter are displayed for sale during a Palm Sunday fair at the Village Museum in Bucharest, Romania on April 12, 2009. Romania’s Orthodox majority celebrates Easter a week after the Catholics. (REUTERS/Bogdan Cristel) #

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Men of the German Slav minority Sorbs, dressed in traditional clothes, ride horses during a ceremonial parade near the village of Ralbitz, Germany, northeast of Dresden on April 12, 2009. More than 1,000 riders took part in several parades to preach the resurrection of Jesus Christ on Easter Sunday. (REUTERS/Pawel Kopczynski) #

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People stand around an Easter bonfire, an old German ethnic custom, in Elbingerode, Germany, on Saturday, April 11, 2009. (AP Photo/Frank Drechsler) #

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Youths stand next to the debris of an Easter bonfire in the northern German village of Worpswede near Bremen on April 12, 2009. (REUTERS/Christian Charisius) #

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Randy Fox, left, Pastor of Fellowship Baptist Church in Skid Row baptizes Sammy Butler during Easter Sunday services in the alley of Emmanuel Baptist Rescue Mission as the congregation cheer on Sunday April 12, 2009 in Los Angeles. (AP Photo/The Los Angeles Times, Lawrence K. Ho) #

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Children race for eggs during an Easter egg hunt on the grounds of Doris Miller Recreation Center in East Austin, Texas, Saturday, April 11, 2009. (AP Photo/Austin American-Statesman, Larry Kolvoord) #

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South Korean Christians pray during an annual Easter Mass in front of the Seoul City Hall, South Korea, Sunday morning, April 12, 2009. About 20,000 Christian devotees wished peace and early reunification of the divided Koreas. (AP Photo/ Lee Jin-man) #

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Easter was still observed in earthquake-torn central Italy – members of the fraternal order of St. Maria of Loreto run across the square of Sulmona as they carry the statue of Madonna che Scappa, or The Madonna Who Runs in the Square, during a Easter Sunday ceremony in L’Aquila, Italy on April 12, 2009. (REUTERS/Alessandro Bianchi) #

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In L’Aquila, Italy, a woman cuts a chocolate Easter egg during a distribution in a tent city set up for people evacuated from their homes following the April 6 earthquake, on Easter Sunday, April 12, 2009. (VINCENZO PINTO/AFP/Getty Images) #

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A dog sits in the place where his owner died in an earthquake in Saint Gregorio village near L’Aquila on easter Sunday, April 12, 2009. (REUTERS/Alessandro Bianchi) #

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U.S. army soldiers sing hymns during Easter sunrise service in Camp Liberty, Baghdad, Iraq, Sunday, April 12, 2009. About 100 U.S. troops attended an Easter sunrise service on Sunday at the U.S. military base Camp Liberty just outside the Iraqi capital. (AP Photo/Marko Drobnjakovic) #

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Iraqi Christians pray during Easter Mass in a church in Baghdad, Iraq, Sunday, April 12, 2009. Iraq’s dwindling Christian community celebrated Easter services Sunday, taking advantage of the improved security in Baghdad and other parts of the country. (AP Photo/Hadi Mizban) #

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An employee of the Ehlego Landkost GmbH company checks colored eggs on April 8, 2009 at the company’s plant in Neuhausen/Spree, eastern Germany. In the weeks before Easter, almost 120,000 eggs were colored per day at the plant. (MICHAEL URBAN/AFP/Getty Images) #

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Bebe Steel and her dog Miss Otis stand in their holiday finery along Fifth Avenue during the annual Easter Parade April 12, 2009 in New York City. The parade is a New York tradition dating back to the mid-1800s when the social elite would parade their new fashions down Fifth Avenue after attending Easter services in one of the Fifth Avenue churches. (Mario Tama/Getty Images) #

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Pakistani Christian girls wait to receive communion during the Easter mass at a catholic church in Peshawar, Pakistan on Sunday, April 12, 2009. Pakistani Christians account for about 3.8 million of Pakistan’s 140 million people. (AP Photo/Mohammad Sajjad) #

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A bucket of water is thrown onto a woman of the Paloc minority, dressed in her traditional clothing, in Holloko, 100 km north-east of Budapest, Hungary, Thursday, April 9, 2009, during a rehearsal performance of a typical Hungarian Easter tradition where men pour water on women. (AP Photo/Bela Szandelszky) #

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Albane Sharrard places chocolate rabbits on a tray after removing them from a mold at Jacques Torres Chocolate in New York, U.S., on Tuesday, April 7, 2009. (Daniel Acker/Bloomberg News) #

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Catholic pilgrims and clergymen hold candles as they walk in procession around the tomb traditionally believed to be the site of the crucifixion and burial of Jesus Christ, during the Easter mass in the Church of the Holy Sepulchre, in Jerusalem’s Old City, Sunday, April 12, 2009. (AP Photo/Tara Todras-Whitehill) #

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Pope Benedict XVI holds a candle during the Easter vigil mass in St. Peter’s Basilica at the Vatican, on April 11, 2009. (Alberto Pizzoli/AFP/Getty Images) #

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Monmouth County Society for the Prevention of Cruelty to Animals Police Chief Victor Amato holds a pet rabbit named Hope Friday, April 10, 2009, in Marlboro, N.J., that had been abandoned in the woods behind the owner’s home. The family got the rabbit last Easter. Hope is regaining its health. (AP Photo/Mel Evans) #

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Workers pour melted chocolate into a mold for a giant Easter egg at the production line of a chocolate factory in Sao Paulo, Brazil, on April 9, 2009. Of the four 165 kg (364 lb) eggs, that were 1.2m (4 ft) tall, and contain 3,705 small chocolate candies each, two were donated and the other two were sold at 14.743 thousand reais (aproximately $6,700 US). (MAURICIO LIMA/AFP/Getty Images) #

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Alexa Heichelheim, 17, is baptized by Pastor Kelley Vaughan during a Seaside Baptist Church Easter Sunrise service on the beach on Sunday April 12, 2009 in Jamaica Beach, Texas. (AP Photo/Houston Chronicle, Mayra Beltran) #

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Christian nuns pray during a midnight prayer service at the Our Lady Of Charity Church on April 11, 2009 in the village of Raikia, India. Christians gathered to pray under threat of continued secular violence in the Kandhamal area. Violence by Hindu extremists towards Christian minorities in the state has seen hundreds killed, over a thousand homes and scores of churches destoyed over the last several months. (Daniel Berehulak/Getty Images) #

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A child looks around while Chinese Catholics participate in an Easter mass at the Nantang church in Beijing, China, Sunday, April 12, 2009. (AP Photo/Andy Wong) #

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People from a choir group sing during a sunrise prayer by Dhaka Pastors Fellowship on Easter Sunday in Dhaka, Bangladesh on April 12, 2009. (REUTERS/Andrew Biraj) #

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A polar bear bites a mock Easter Bunny stuffed with food at the Buenos Aires Zoo in Argentina on April 9, 2009. (REUTERS/Enrique Marcarian) #

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A crowd gathers on the slope of the Lizard Butte just outside Caldwell, Idaho on Sunday, April 12, 2009. For 72-years crowds have been gathering at this spot on this rocky hillside to celebrate the Easter holiday. (AP Photo/The Idaho Press-Tribune, Charlie Litchfield) #

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Bulgarian Catholic women hold candles during the Easter vigil mass in the Cathedral of Saint Michael the Archangel in the town of Rakovski, Bulgaria on April 11, 2009. (DIMITAR DILKOFF/AFP/Getty Images) #

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A Christian girl lights a candle as others pray to a shrine of Mother Mary during a midnight prayer service at the Our Lady Of Charity Church on April 11, 2009 in the village of Raikia, India. (Daniel Berehulak/Getty Images) #

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Catholic worshippers hold candles during the Easter mass at a church in Xiaohan village of Tianjin municipality, China on April 11, 2009. (REUTERS/Vincent Du) #

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Mehmet Cerezcioglu of Scituate, Massachusetts, listens during a sunrise Easter service at the Scituate Lighthouse, organized by the Scituate Clergy Association on April 12, 2009. Cerezcioglu, who is orginally from Turkey, spends half the year in Scituate and the other half in Istanbul. “I’m not a Christian, but I love Jesus, I love Buddha,” said Cerezcioglu, and said he woke up this morning on minimal sleep and made his way out to the service