A poison dart frog of the dendrobates genus clings to a leaf at the
Botanic Gardens in Medellin April 22, 2010. (REUTERS/Fredy Builes) #

An explosion, part of mining technology, takes place at Olimpiadinskoye
gold mine, 660 km (410 mi) northeast of Russia's Siberian city of
Krasnoyarsk, April 13, 2010. (REUTERS/Ilya Naymushin) #

Windmills turn in the breeze at Horns Rev 2, the world's largest wind farm, 30 km
(19 mi) off the west coast of Denmark near Esbjerg September 15, 2009.
(REUTERS/Bob Strong) #

A visitor takes photographs of cherry blossoms at the Royal Botanic
Gardens in Kew, west London April 15, 2009. (REUTERS/Eddie Keogh) #

The eye and skin of a circus elephant, seen in the sun in Berlin, Germany
on Wednesday, April 7, 2010. (AP Photo/Markus Schreiber) #

An armored vehicle from the Centurion Company, 2-1 Infantry Battalion, 5/2
Stryker Brigade Combat Team is framed by a bolt of lightning during a
storm at Combat Outpost Terminator in Maiwand District, Kandahar
Province, Afghanistan on April 19, 2010. (REUTERS/Tim Wimborne) #

Skeletal remains of cattle lie on the shore of the Grijalva river in
Villahermosa April 20, 2010. According to Mexico's National Committee
for Protected Areas (CONANP), 12 tons of garbage are illegally dumped
daily at the Canyon del Sumidero where the river runs through.
(REUTERS/Luis Lopez) #

A general view shows a "solucar" solar park in Sanlucar La Mayor, near
Seville, Spain. (REUTERS/Marcelo del Pozo) #

A worker unloads coal at a storage site along a railway station in
Shenyang, Liaoning province April 13, 2010. (REUTERS/Sheng Li) #

A gray whale surfaces near the mouth of the Duwamish River late Saturday
March 27, 2010 in Seattle, Washington. The nearly 40 foot-long animal
was watched by excited spectators as it hugged the shore around the West
Seattle peninsula earlier in the day. Gray whales are not as common in
Puget Sound as orca whales; gray whales are rarely seen in Elliott Bay
near downtown Seattle. Maritime officials with the Port of Seattle were
concerned the whale would attempt to travel up the Duwamish River, a
major industrial area and Superfund site. (AP Photo/Seattle Post
Intelligencer, Joshua Trujillo) #

A worker walks past a wall made of recycled plastic bottles at the Flora
Expo construction site in Taipei, taiwan on April 13, 2010. The world's
first green building made of plastic bottles will be used as one of the
14 exhibition halls at the 2010 Taipei International Flora Expo,
starting from November 6. (SAM YEH/AFP/Getty Images) #

Hoover Dam, on the on the Colorado River, on the border of Arizona and Nevada,
seen from a DigitalGlobe satellite on February 28, 2010. The energy
generated by Hoover Dam annually is about 4.2 billion kilowatt-hours. (DigitalGlobe)
#

Swans stretch and swim after being released from their winter quarters on
Hamburg's city lake Alster April 12, 2010. Every year the swans are
collected from waterways around Hamburg and taken to winter quarters
where they are fed and cared for until the spring. (REUTERS/Christian
Charisius) #

A Union Pacific freight train passes between windmills on January 17,
2010 near of Palm Springs, California. (David McNew/Getty Images) #

The underside of space shuttle Discovery is visible in this image
photographed by an Expedition 23 crew member on the International Space
Station soon after the shuttle and station began their post-undocking
relative separation on April 17th, 2010. The recognizable feature on
Earth below is the south end of Isla de Providencia, about 150 miles off
the coast of Nicaragua. (NSAA) #

A mature bald eagle calls out to its mate Monday, April 12, 2010, near
the the confluence of the Tanana and Chena Rivers outside of Fairbanks,
Alaska. (AP Photo/The Fairbanks Daily News-Miner, John Wagner) #

Young Indian ragpickers search for valuables and recyclable materials at the
city's largest legal municipal waste landfill in Mavallipura village on
the outskirts of Bangalore on April 20, 2010. (DIBYANGSHU
SARKAR/AFP/Getty Images) #

A woman herds horses along a snow covered road in a valley below
Iceland's Eyjafjallajokull volcano, near Evindarholar April 22, 2010.
(REUTERS/Lucas Jackson) #

Cape Cod, Massachusetts, as seen from the International Space Station on
April 14th, 2010. The image spans just over 80 km (50 mi). (NASA) #

Mike Cianchette, operations manager of the Stetson Mountain wind project,
checks his safety line before making inspections on top of  a 300-foot
tall windmill, in Range 8, Township 3, Maine on July 14, 2009. (AP
Photo/Robert F. Bukaty) #

A larval tube-anemone fishes for food with the tentacles it will use as
an adult as seen in an undated handout photo released April 18, 2010.
(REUTERS/Cheryl Clarke-Hopcroft/UAF/CMarZ) #

The Northern Lights appear above the ash plume of Iceland's
Eyjafjallajokull volcano in the evening April 22, 2010. (REUTERS/Lucas
Jackson) #

A young male giraffe named Carlo takes his first walk around an outdoor
enclosure with his parents at the zoo in the southern German city of
Nuremberg on April 20, 2010. (Timm Schamberger/AFP/Getty Images) #

A worker looks through a solar concentrator panel at the Gadhia solar
energy systems manufacturing unit at Gundlav village, about 400 km (250
mi) south of the Ahmedabad, India on December 16, 2009. (REUTERS/Amit
Dave) #

Health officials on a truck spray chemicals to disinfect animal farms around
the village where outbreaks of foot-and-mouth disease were reported in
Gimpo, about 30 km (18 miles) northwest of Seoul, South Korea on April
20, 2010. (REUTERS/Ha Sa-Hun/Yonhap) #

High above the African continent, tall, dense cumulonimbus clouds loom on
April 22, 2010. The clouds can form alone, in clusters, or along a cold
front in a squall line. The high energy of these storms is associated
with heavy precipitation, lightning, high wind speeds and tornadoes.
(AFP/Getty Images/NASA) #

Kurniah collects rust from a beach at a ship demolition site, near Tanjung
Priok port in Jakarta, Indonesia on April 16, 2010.  Kurniah said she
can earn approximately $2 after collecting about 100 kg (220 lbs) of
rust a day.  The rust is sold to a middleman who will sell it to a
factory that will recycle it. (REUTERS/Enny Nuraheni) #

A plastic bottle rests on cracked earth at Las Canoas Lake, 59 km (37 mi)
north of the capital Managua, Nicaragua on April 20, 2010. The water
level of the lake has fallen to dangerously low levels due to a severe
drought. (REUTERS/Oswaldo Rivas) #

The Sun appears slightly squished in this image of the Earth eclipsing the
Sun seen from NASA's recently-launched Solar Dynamics Observatory in
high orbit. An instrument on board, the Helioseismic and Magnetic
Imager, was undergoing a series of adjustments when its view was
partially blocked by the Earth. At the edges of the shadow, the Sun's
shape bends, due to the light's refraction by the Earth's atmosphere.
(NASA) #

A crowd watch as a baby hawksbill turtle swims into the deep after a
symbolic release ceremony on Pramuka Island located north of Jakarta,
Indonesia on April 20, 2010.  Twenty baby hawksbill turtles and four
four months old hawksbill turtles were released from the turtle
conservation area. (ROMEO GACAD/AFP/Getty Images) #

A late afternoon rainbow appears briefly above Port Susan near Stanwood,
Washington on April 5, 2010. (AP Photo/Skagit Valley Herald, Frank
Varga) #

A interior view of several large turbines at the construction site of the
Three Gorges Dam in Yichang, Hubei province, China on September 10,
2009. (REUTERS/China Daily) #

Palestinian beekeepers inspect hives at an apiary near the central Gaza Strip
refugee camp of Bureij on April 19, 2010. (MOHAMMED ABED/AFP/Getty
Images) #

In this Friday night April 2, 2010 picture, people watch the sunset from
the edge of the frozen mudflats near Elderberry Park in Anchorage,
Alaska. The Mt. Spurr volcano is at right. (AP Photo/Anchorage Daily
News, Anne Raup) #

A man rows a boat down a flooded street in the village of Radul, north of
Kiev, Ukraine on April 19, 2010. (REUTERS/Konstantin Chernichkin) #

An aircraft passes the moon over Frankfurt, Germany on Thursday, April 22,
2010, as German air traffic went back to normality following the
airspace closure due to the volcanic ash cloud that came from Iceland.
(AP Photo/Michael Probst) #

A man takes a break on a sunny day on the grass of LaFayette Park near
the White House in Washington, D.C. on April 22, 2010. (REUTERS/Jonathan
Ernst) #