Sergei Ilnitsky

2011 was a year of global tumult, marked by widespread social and political uprisings, economic crises, and a great deal more. We saw the fall of multiple dictators, welcomed a new country (South Sudan), witnessed our planet's population grow to 7 billion, and watched in horror as Japan was struck by a devastating earthquake, a tsunami, and a nuclear disaster. From the Arab Spring to Los Indignados to Occupy Wall Street, citizens around the world took to the streets in massive numbers, protesting against governments and financial institutions, risking arrest, injury, and in some cases their lives. Collected here is Part 3 of a three-part photo summary of the last year, covering 2011's last months. Be sure to also see Part 1, and Part 2, totaling 120 images in all. [40 photos]

Occupy Wall Street protesters march and hold signs in New York City on September 17, 2011. Frustrated protesters had been speaking out against corporate greed and social inequality on and near Wall Street for the previous two weeks, further sparking a protest movement that spread across the world. Original here. (CC BY SA Carwil Bjork-James)

People observe a moment of silence during ceremonies at the World Trade Center site for the 10th anniversary of the terrorist attacks on lower Manhattan on September 11, 2001 in New York City. New York City and the nation are commemorating the 10th anniversary of the terrorist attacks on lower Manhattan which resulted in the deaths of 2,753 people when two hijacked planes crashed into the World Trade Center. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb.

A P-51 Mustang airplane crashes into the edge of the grandstands at the Reno Air show on Friday, Sept. 16, 2011 in Reno Nevada. The World War II-era fighter plane flown by a veteran Hollywood stunt pilot Jimmy Leeward plunged Friday into the edge of the grandstands during the popular air race creating a horrific scene strewn with smoking debris.

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People observe a moment of silence during ceremonies at the World Trade Center site for the 10th anniversary of the terrorist attacks on lower Manhattan on September 11, 2001 in New York City. New York City and the nation are commemorating the 10th anniversary of the terrorist attacks on lower Manhattan which resulted in the deaths of 2,753 people when two hijacked planes crashed into the World Trade Center. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Spencer Platt/Getty Images) #

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The Tribute in Light rises over the Brooklyn Bridge and lower Manhattan, Monday, Sept. 12, 2011, in New York. A day earlier the city held a memorial at Ground Zero for the 10th anniversary of the attacks on the United States. (AP Photo/Julio Cortez) #

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In this Monday, Sept. 12, 2011 image taken from video, a group of people tilt a burning BMW up to free Brandon Wright, on his back on the ground, who was pinned underneath after he collided with the car while riding his motorcycle on U.S. 89 in Logan, Utah. Authorities said Wright was riding his motorcycle near the Utah State University campus in Logan when the 21-year-old collided with the BMW that was pulling out of a parking lot. Tire and skid marks on the highway indicate that Wright laid the bike down and slid along the road before colliding with the car, Assistant Police Chief Jeff Curtis said. (AP Photo/Chris Garff) #

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A visitor poses in front of a beluga swimming inside an aquarium at the Laohutan Ocean Park in Dalian, in northeast China's Liaoning province, Saturday, Sept. 17, 2011. (AP Photo/Andy Wong) #

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A woman at the National September 11 Memorial, Sunday, Sept. 11, 2011, mourns the loss of her son who died during during attacks at the World Trade Center, Sept. 11, 2001. (AP Photo/Carolyn Cole, Pool) #

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Robert Peraza, who lost his son Robert David Peraza in the attacks at the World Trade Center, pauses at his son's name at the North Pool of the 9/11 Memorial before the 10th anniversary ceremony at the site, Sunday Sept. 11, 2011, in New York. (AP Photo/Justin Lane, Pool) #

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A man walks among nearly 3,000 flags set up as part of a remembrance on 10th anniversary of the Sept. 11 terrorist attacks Sunday, Sept. 11, 2011, in St. Louis. (AP Photo/Jeff Roberson) #

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A rose is placed on an inscribed name along the North Pool of the 9/11 Memorial during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City. New York City and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Justin Lane-Pool/Getty Images) #

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The Tribute in Light shines above Lower Manhattan, marking the 10th anniversary of the attacks at the World Trade Center site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Matt Rourke) #

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In this Friday, Sept. 16, 2011 photo, a P-51 Mustang airplane approaches the ground right before crashing during an air show in Reno, Nev. The vintage World War II-era fighter plane piloted by Jimmy Leeward plunged into the grandstands during the popular annual air show. (AP Photo/Garret Woodman) #

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A P-51 Mustang airplane crashes into the edge of the grandstands at the Reno Air show on Friday, Sept. 16, 2011 in Reno Nevada. The World War II-era fighter plane flown by a veteran Hollywood stunt pilot Jimmy Leeward plunged Friday into the edge of the grandstands during the popular air race creating a horrific scene strewn with smoking debris. (AP Photo/Ward Howes) #

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A single engine T-28 from the six-plane Trojan Horsemen Demonstration Flight Team crashes and explodes during a performance at the Thunder Over the Blue Ridge Open House and Air Show, Saturday, Sept. 17, 2011 at the 167th Airlift Wing in Martinsburg, W.Va. (AP Photo/Journal Newspaper, Ron Agnir) #

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A firefighter places an American flag on a memorial display while preparing for 9/11 ceremonies at FDNY Ladder 20 Engine 13 on September 9, 2011 in New York City. Ladder 20 lost seven firefighters on September 11, 2001. New York City and the nation are preparing for the 10th anniversary of the terrorist attacks on lower Manhattan, which resulted in the deaths of 2,753 people at the World Trade Center(Photo by Mario Tama/Getty Images) #

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Las Vegas firefighter Capt. Eric Littmann walks in a parade commemorating the 2001 attacks on the World Trade Center and the Pentagon, Sunday, Sept. 11, 2011, in Las Vegas. ( AP Photo/Julie Jacobson) #

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A general view shows a crowded beer tent during the opening day of the Oktoberfest 2011 beer festival at Theresienwiese on September 17, 2011 in Munich, Germany. The world's biggest beer festival starts September 17 and runs until October 3, 2011. (Photo by Alexandra Beier/Getty Images) #

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Floyd Mayweather Jr., left, watches as referee Joe Cortez gives Victor Ortiz Floyd a ten count after he was knocked down by Mayweather during their WBC welterweight title fight Saturday, Sept. 17, 2011, in Las Vegas. (AP Photo/Julie Jacobson) #

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The street circuit of the Formula One night race is illuminated during a light testing seen from Swissotel The Stamford at dusk on Monday, Sept. 19, 2011 in Singapore which will be the host city for the SingTel Singapore Grand Prix from Sept. 23-25. (AP Photo/Wong Maye-E) #

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Palestinian children gather near the beach in Deir Al Balah, central Gaza Strip, Thursday, Sept. 15, 2011. (AP Photo/Bernat Armangue) #

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2nd Lt. Andrew Ferrara, 23, of Torrance, Calif., with the U.S. Army's Bravo Company of the 25th Infantry Division, 3rd Brigade Combat Team, 2nd Battalion 27th Infantry Regiment, based in Schofield Barracks, Hawaii, turns from the rotor wash of a landing Blackhawk helicopter during a mission for a key leader engagement at the Shigal district center Thursday, Sept. 15, 2011 in Kunar province, Afghanistan. (AP Photo/David Goldman) #

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Air Force One, with President Barack Obama aboard, arrives at Raleigh Durham International Airport in Morrisville, N.C., Wednesday, Sept. 14, 2011, where President Obama will speak about the American Jobs Act. (AP Photo/Jim R. Bounds) #

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Firefighters try to put out a wildfire at a national reserve in Brasilia, Brazil, Monday, Sept. 9, 2011. Drought, high temperatures and low humidity have caused wildfires at several places around Brasilia, according to officials. (AP Photo/Eraldo Peres) #

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Joseph Mwangi, 34, sits in a state of shock after discovering the charred remains of two of his children, one aged 6 the other of unknown age, at the scene of a fuel explosion in Nairobi, Kenya, Monday, Sept. 12, 2011. A leaking gasoline pipeline in Kenya's capital exploded on Monday, turning part of a slum into an inferno in which scores of people were killed and more than 100 hurt. (AP Photo/Ben Curtis) #

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Survivors use flotsam Saturday, Sept 10, 2011, after an overcrowded ship sank in deep sea between mainland Tanzania and Pemba Island at about 1 a.m. Saturday with about 600 people onboard. The numbers involved are unclear as the ferry, M.V. Spice Islanders, is thought to have been heavily overloaded and some potential passengers refused to board when it was leaving the mainland port of Dar es Salaam, said survivor Abdullah Saied. About 230 people have been rescued and 40 bodies recovered but about 370 people are still reported missing, said Mohamed Aboud, minister for the Vice President's Office. (AP Photo/Capt Neil van Ejik Whirlwind Aviation) #

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A German soldier lifts weights at his combat outpost in Char Darah, outisde Kunduz, Afghanistan, Saturday, Sept. 17, 2011. (AP Photo/Anja Niedringhaus) #

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A man sets himself on fire outside a branch of Piraeus bank in the northern port city of Thessaloniki, Greece, Friday Sept. 16, 2011. It was a third attempted self-immolation by the former small business owner, who says he was ruined after taking a series of bank loans. The 56-year-old was hospitalized with non life-threatening chest burns. (AP Photo/Nontas Stlianidis) #

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A girl runs across a flooded road as water recedes in Puri district, about 55 kilometers (34 miles) from the eastern Indian city of Bhubaneshwar, Friday, Sept. 16, 2011. Aerial food drops were suspended after five days Friday as flood waters began to recede in the Mahanadi delta in Orissa state. At least 26 people died and 12 others went missing during the devastating floods which affected people in 19 districts of the state, official sources said. (AP Photo/Biswaranjan Rout) #

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Soyuz TMA-21 space capsule lands with Expedition 28 Commander Andrei Borisenko, and Flight Engineers Ron Garan, and Alexander Samokutyayev in a remote area outside of the town of Zhezkazgan, Kazakhstan, on Friday, Sept. 16, 2011. NASA Astronaut Garan, Russian Cosmonauts Borisenko and Samokutyaev are returning from more than five months onboard the International Space Station where they served as members of the Expedition 27 and 28 crews. (AP Photo/Sergei Ilnitsky, Pool) #

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NASA Astronaut Ron Garan, left, Russian cosmonauts Alexander Samokutyayev, center, and Andrei Borisenko, right, are seen inside Russian Soyuz TMA-21 space capsule after its landing about 150 kilometers (94 miles) southeast of the Kazakh town of Zhezkazgan, Kazakhstan, on Friday, Sept. 16, 2011. NASA Astronaut Garan, Russian Cosmonauts Borisenko and Samokutyayev are returning from more than five months onboard the International Space Station where they served as members of the Expedition 27 and 28 crews. (AP Photo/Sergei Remezov, Pool) #

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Nepalese women remove bricks of the damaged house to make way for pedestrians after an earthquake of magnitude 6.9 shook northeastern India on Sunday night, in Katmandu, Nepal, Monday, Sept. 19, 2011. Rescue workers used shovels and their bare hands to pull bodies from the debris of collapsed buildings Monday, as the death toll from an earthquake that hit northeast India, Nepal and Tibet rises. (AP Photo/Niranjan Shrestha) #