Americas

The Tungurahua volcano throws ash and stones during an eruption seen from Banos, Ecuador, Sunday, Aug. 31, 2014. The volcano entered an eruptive phase in 1999 and continues to this day.

Dolores Ochoa/AP

The Tungurahua volcano throws ash and stones during an eruption seen from Banos, EcuadorRead more

A woman walks her dogs by police temporarily blocking protesters from entering one of the main roads into the capital, on the outskirts of Buenos Aires, Argentina, Thursday, Aug. 28, 2014. Opposition labor unions are demanding more jobs, better salaries and tax cuts with protests and a 36-hour strike that started Wednesday. The protest comes amid deepening economic troubles for Argentina, with the economy in recession and inflation running around 40 percent.

Natacha Pisarenko/AP

A woman walks her dogs by police temporarily blocking protesters from entering one of the main roads into the capital, on the outskirts of Buenos Aires, Argentina. Opposition labour unions are demanding more jobs, better salaries and tax cuts with protests and a 36-hour strike

Protesters stand in the street as lightning flashes in the night sky in Ferguson, Mo. on Wednesday, Aug. 20, 2014. A grand jury has begun hearing evidence as it weighs possible charges against the Ferguson police officer who fatally shot 18-year-old Michael Brown. (AP Photo/Jeff Roberson)

Jeff Roberson/AP

Lightning flashes over protesters on the streets of Ferguson, Missouri. A grand jury has begun hearing evidence as it weighs possible charges against the Ferguson police officer who fatally shot 18-year-old Michael Brown. Read more

Giant inflatable rubber duck installation by Dutch artist Hofman floats through the Port of Los Angeles as part of the Tall Ships Festival, in San Pedro...A giant inflatable rubber duck installation by Dutch artist Florentijn Hofman floats through the Port of Los Angeles as part of the Tall Ships Festival, in San Pedro, California August 20, 2014. The creation, which is five stories tall and five stories wide, has been seen floating in various cities around the world since 2007. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SOCIETY MARITIME TPX IMAGES OF THE DAY)

Lucy Nicholson/Reuters

A giant inflatable rubber duck installation by Dutch artist Florentijn Hofman floats through the Port of Los Angeles as part of the Tall Ships Festival, in San Pedro, California. The creation, which is five stories tall and five stories wide, has been seen floating in various cities around the world since 2007. Read more

epa04360584 Police in riot gear move in to make arrests as demonstrators protest the shooting death of Michael Brown in Ferguson, Missouri, USA, 19 August 2014. Protestors took to the streets of Ferguson, Missouri for another day to voice their outcry over the police slaying of an unarmed black teenager.  EPA/LARRY W. SMITH

Larry W. Smith/EPA

Police in riot gear move in to make arrests as demonstrators protest the shooting death of Michael Brown in Ferguson, Missouri. Protestors took to the streets of Ferguson, Missouri for another day to voice their outcry over the police slaying of an unarmed black teenager. Read more

Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri...Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri August 18, 2014. Police fired tear gas and stun grenades at protesters on Monday after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW CIVIL UNREST)

Joshua Lott/Reuters

Police officers aim their weapons at demonstrators, having fired tear gas and stun grenades at protesters in Ferguson, Missouri. Read more

The super moon behind the Christ the Redeemer statue in Rio de Janeiro August 11, 2014. Occurring when a full moon or new moon coincides with the closest approach the moon makes to the Earth, the supermoon results in a larger-than-usual appearance of the lunar disk.

Pilar Olivares/Reuters

The supermoon behind the Christ the Redeemer statue in Rio de Janeiro

The media watches as a Space X falcon 9 rocket carrying the AsiaSat 8 Satellite liftoff early Tuesday, Aug. 5, 2014 from the Cape Canaveral, Fla.,  Air Force Station.  The rocket carried the Asiasat-8 spacecraft which will support direct broadcasting, private networks and broadband connectivity for customers in China, India, Southeast Asia and the Middle East.  (AP Photo/Florida Today, Craig Rubadoux)  NO SALES

Craig Rubadoux/AP

The media watches as a Space X falcon 9 rocket carrying the AsiaSat 8 Satellite lifts off from the Cape Canaveral, Florida, Air Force Station. The rocket carried the Asiasat-8 spacecraft which will support direct broadcasting, private networks and broadband connectivity for customers in China, India, Southeast Asia and the Middle East. Read more

A long exposure image shows the El Portal Fire burning near Yosemite National Park, California, USA. On the morning of 28 July, the fire had burned over 2,500 acres (1,011 hectares) and was just 5% contained. More than 400 firefighters and several helicopters are battling the flames near Yosemite.

Stuart Palley/EPA

The El Portal Fire burning near Yosemite National Park, California, USA. On Monday morning the fire had burned over 2,500 acres (1,011 hectares) and was just 5% contained

Lake Mead At Historic Low Levels As Drought Continues In Western US...LAKE MEAD, NRA, NV - JULY 17:  A boat sails on Lake Mead on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. Last week, North America's largest man-made reservoir dropped below 1,082 feet above sea level, the lowest it's been since the Hoover Dam was built in the 1930s. A 14-year drought in the Southwestern United States and a dwindling supply of water from the Colorado River, in part due to cuts in the reservoir's annual allocation of water from Lake Powell, has left a white "bathtub ring" of mineral deposits left by higher water levels on the rocks around the lake as high as 130 feet. The National Park Service has been forced to close or extend boat launch ramps, and move entire marinas to try to keep up with the receding water levels.  (Photo by Ethan Miller/Getty Images)

Ethan Miller/Getty

A boat sails on Lake Mead on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. Last week, North America’s largest man-made reservoir dropped below 1,082 feet above sea level, the lowest it’s been since the Hoover Dam was built in the 1930s. A 14-year drought in the Southwestern United States and a dwindling supply of water from the Colorado River, in part due to cuts in the reservoir’s annual allocation of water from Lake Powell, has left a white “bathtub ring” of mineral deposits left by higher water levels on the rocks around the lake as high as 130 feet. Read more