Bride Fan Huixiang (front R), a 25-year-old cancer patient, receives flowers from nurses on her bed before her wedding ceremony at a hospital in Zhengzhou, Henan province November 17, 2014. Fan was diagnosed with late stage adenocarcinoma, a type of cancerous tumor, at her thoracic vertebra this June. She and her 24-year-old husband Yu Haining held their wedding ceremony at the hospital on Monday after five years of relationship, local media reported. (Photo by Reuters/China Daily)

A protester gestures after he saw a dead protester in Kampala, Uganda February 15, 2016. At least one person has been killed in Uganda's capital Kampala as police clashed with opposition supporters after briefly detaining a top presidential candidate twice as he tried to hold campaign rallies days before a general election. Several people were wounded in the clashes as police fired bullets and tear gas while opposition supporters hurled rocks and erected street barricades in the capital's Wandegeya suburb, witnesses said according to a Reuters news agency report. (Photo by Goran Tomasevic/Reuters)

Growing cities, overuse of fertilizers and factory wastewater have degraded China's water supplies to the extent that half the nation's rivers and lakes are severely polluted. China aims to spend $850 billion to improve filthy water supplies over the next decade, but even such huge outlays may do little to reverse damage caused by decades of pollution and overuse in Beijing's push for rapid economic growth. Photo: Fishermen row a boat in the algae-filled Chaohu Lake in Hefei, Anhui province, June 19, 2009. (Photo by Jianan Yu/Reuters)

Assistant Manager Jayesh Vaghela brushes a vintage silk top hat at Lock & Co. Hatters on March 22, 2011 in London, England. Founded in St. James's in 1676, when Charles II was on the throne, this family owned business has provided hats for Royalty and the gentry for over 300 years. Staff report that sales of formal hats are booming ahead of the wedding of Prince William and Kate Middleton in Westminster Abbey on April 29, 2011.

A fisherman is seen standing on a cliff edge at Cape Bank in La Perouse on February 20, 2011 in Sydney, Australia. The practice of fishing from rock platforms, cliffs and rocky outcrops is notoriously dangerous with many anglers per year being washed into the ocean by dangerous surf or unexpected large waves. Angling is often reported as the sport having the highest mortality rate on average due to fishermen drowning with rocking fishing contributing to a high number of these deaths. (Photo by Mark Kolbe/Getty Images)

Rioters scuffle with police on a street in Mongkok district of Hong Kong, Tuesday, February 9, 2016. Rioters clashed with police overnight and into the early hours of Tuesday in a crowded area of Kowloon. The unrest started when local authorities tried to prevent street food sellers from operating on Monday night. Activists who are dissatisfied with Hong Kong's administration took part in the clashes, local media reports said. (Photo by Kin Cheung/AP Photo)

Tacos of Cochinita Pibil, a popular dish from Yucatan, are seen during an attempt to break the Guinness World Record for the world's longest taco in Guadalajara February 15, 2015. Guadalajara broke the Guinness record for the longest taco of cochinita pibil, with a length of 2.5 kilometers, as part of the COME gastronomy festival, local media reported. For the preparation of the traditional dish, the chefs used 4 tons of pork, 36,000 tortillas and spices for 325 taco servings. (Photo by Alejandro Acosta/Reuters)

The interior of a house is damaged after an earthquake in Imphal, capital of the northeastern Indian state of Manipur, Monday, January 4, 2016. Five deaths have been reported from in and around Imphal due to falling debris. Imphal has a population of 270,000, and people were jolted from their sleep and ran out of their homes in panic. (Photo by Bullu Raj/AP Photo)