Global wildlife populations will decline by 67% by 2020 unless urgent action is taken to reduce human impact on species and ecosystems, warns the biennial Living Planet Index report from WWF (World Wide Fund for Nature) and ZSL (Zoological Society of London). From elephants to eels, here are some of the wildlife populations most affected by human activity. Here: The maned wolf is among the large mammals in the Brazilian Cerrado that are threatened by the increasing conversion of grasslands into farmland for grazing and growing crops. (Photo by Ben Cranke/Nature Picture Library/Alamy Stock Photo)

People take pictures of the sun rising next to the buildings of the banking district in Frankfurt, Germany, Saturday, December 28, 2019. (Photo by Michael Probst/AP Photo)

A young boy scoops water from a hand-dug well in the dry riverbed near Matinyani, in the semi-arid Kitui County in southeastern Kenya, 22 March 2015, the World Water Day. Residents of Kitui County and other arid and semi-arid areas of the country have been hard-hit by extremely poor rainfall this year while the government said in previous month that some 1.6 million people countrywide are facing acute starvation due to the drought and will need relief food over the next six months. Residents of Matinyani say they haven't seen a drop of rain in nearly four months. Thousands of Kenyans in rural areas walk tens of kilometers just to fetch water to drink and to be used in their homes. According to an estimate by UNESCO (United Nations Educational, Scientific and Cultural Organization), 17 million people lack access to safe water in Kenya, where the drought is a perennial problem. (Photo by Dai Kurokawa/EPA)

Performers Aidee Arely Ramirez Arellano (left) and Viridiana Mayte Arica Rico from Banda Monumental De Mexico who are part of this year's Royal Edinburgh Military Tattoo cast, display their Monarch butterfly costumes in Princes Street Gardens, Edinburgh on Thursday, August 25, 2022, ahead of the final weekend of this year's show, Voices. The butterfly costumes are a tribute to the Duke of Edinburgh and the Queen's Platinum Jubilee, inspired by an image of the Duke of Edinburgh watching the butterflies migration during a trip he attended to support conservation of the species. (Photo by Jane Barlow/PA Wire)

This photo taken on November 6, 2023 shows people posing for photos next to the statue of “Hachiko” in front of Shibuya station in central Tokyo, ahead of the 100th anniversary of the legendary dog's birth this month. A century since its birth, the tale of the loyal companion who had waited at the Shibuya train station for its master to come home – not knowing he had already died – continues to inspire the public, who have made the statue a singular landmark at a glitzy hub of Tokyo's street culture. (Photo by Richard A. Brooks/AFP Photo)

A young festivalgoer jumps to burst a bubble at Latitude Festival at Henham Park, Britain, July 22, 2021. (Photo by Peter Cziborra/Reuters)

A flock of sheep and goats is led by shepherds to pastures at a mountain village on the outskirts of Sana'a, Yemen, 27 July 2023. At least eight million sheep and goats from about 470,000 pastoralist and agro pastoralist households across Yemen will be treated and vaccinated over the two years 2023 and 2024, in an effort to reduce livestock losses, improve production efficiency, and household income generation amid an acute food insecurity, the UN Food and Agriculture Organization (FAO) has reported. (Photo by Yahya Arhab/EPA)

In this February 7, 2014 file photo, Matt Figi hugs and tickles his once severely-ill seven year old daughter Charlotte, as they walk together inside a greenhouse for a special strain of medical marijuana known as Charlotte's Web, which was named after the girl early in her treatment for crippling severe epilepsy, in the mountains west of Colorado Springs, Colo. Colorado is poised to award more than $8 million for medical marijuana research, a step toward addressing complaints that little is known about pot's medical potential. Among the research projects poised for approval on Wednesday, December 17, 2014, are one for pediatric epilepsy patients, and another for children with brain tumors. (Photo by Brennan Linsley/AP Photo)