In this picture taken on September 24, 2016, relatives grieve their lost one, an alleged drug user/dealer gunned down by unidentified gunmen in Manila. Philippine President Rodrigo Duterte defended his threat to kill criminals as “perfect” and vowed no let-up in his war on crime, as the death toll surged past 3,700. (Photo by Noel Celis/AFP Photo)

In this September 17, 2010 file photo a little brown bat is photographed in La Crosse Wis. Researchers for the first time found that little brown bats appear to be showing resistance to white-nose syndrome, which has killed millions of bats across North America. (Photo by Peter Thomson/La Crosse Tribune via AP Photo)

Padaung ethnic women arrive to listen to the speech of Myanmar opposition leader Aung San Suu Kyi (not in picture), Chairwoman of the National League for Democracy (NLD) party, during Suu Kyi's first official election campaign at Demoso township of Kayah State, eastern Myanmar, 10 September 2015. Suu Kyi is on a three-day visit to Kayah State near the Thai-Myanmar border, as part of her first official election campaign. Myanmar political parties and candidates started their campaigns on 08 September ahead of the upcoming general election, which will be held on 08 November 2015. (Photo by Lynn Bo Bo/EPA)

A performer dances at a housing exhibition in Wuhan, Hubei province, China, September 27, 2015. (Photo by Reuters/Stringer)

Indian women wearing traditional attire take a “selfie” with an Indian man dressed as King 'Mahabali' during the Hindu harvesting festival Onam celebrations in Bangalore, India, 28 August 2015. Local people put flower mats in front of their houses, to welcome the King Mahabali, a past ruler of Kerala southern India, during the ten-day festival. (Photo by Jagadeesh N. V./EPA)

This handout picture taken and released by the Borneo Orangutan Survival Foundation (BOSF) on October 26, 2015 shows baby orangutans, which had previously suffered from respiratory problems, playing at a nursery in the rehabilitation centre operated by the BOSF on the outskirts of Palangkaraya in Central Kalimantan. Endangered orangutans are falling victim to a devastating haze crisis that has left them sick, malnourished and severely traumatised as fires rage through Indonesia's forests, reducing their habitat to a charred wasteland. (Photo by AFP Photo/Borneo Orangutan Survival Foundation/Indrayana)

A woman wearing a mask walk in a street in a Yonghegong Lama temple compound seen shrouded in smog in Beijing, China, 30 November 2015. Beijing issued an orange alert for heavy smog 30 November, the highest level this year. Authorities in the Chinese capital warned of 'severe pollution' and advised the capital's 20 million inhabitants to stay indoors. (Photo by How Hwee Young/EPA)

Participants of the 77th edition of the annual Christmas swimming 'Coupe de Noel' jump into the waters of Lake Geneva, in Geneva, Switzerland, 20 December 2015. More than 1,540 men and women braved the water temperature of just 8 degrees Celsius as they swam a 120 meters distance at the traditional Christmas swimming in Geneva. (Photo by Salvatore Di Nolfi/EPA)