A homeless man rests on the side of a street at the old quarter of Yemen's capital Sanaa November 27, 2015. (Photo by Khaled Abdullah/Reuters)

A boy attends the “Bloco da Lama” (Block of Mud) group during the carnival festivities, in Paraty, Brazil on February 11, 2024. (Photo by Pilar Olivares/Reuters)

Palestinian children, with empty containers, wait in a line for food, distributed by charity organizations, since Palestinians are unable to obtain basic food supplies due to the embargo imposed by Israeli forces in Rafah, Gaza on February 25, 2024. (Photo by Abed Zagout/Anadolu via Getty Images)

Lightning streaks across the skies over the coastal port city of Batroun, some 43km north of the Lebanese capital Beirut on December 6, 2023. (Photo by Ibrahim Chalhoub/AFP Photo)

In this March 29, 2016 photo, a man shoulders a coffin with the remains of a loved one who was slain more than two decades ago by Shining Path rebels, as he walks to the cemetery for a group burial service, in Ccano, a village in the Huanta area of Ayachcuo department, Peru. Presidential candidate Keiko Fujimori's base of support is in places like Ccano, where promises to build roads, clinics and schools recall her agronomist father’s own legacy of delivering aid to the long-overlooked countryside. (Photo by Rodrigo Abd/AP Photo)

Relatives of the victims, died in the Israeli airstrikes, mourn as they take the bodies from the morgue of Nasser Hospital for the funeral ceremony as the Israeli army attacks continue in Khan Yunis, Gaza on November 14, 2023. (Photo by Belal Khaled/Anadolu via Getty Images)

Pupils from St Teilo’s Catholic Primary School in Tenby, South Wales, perform a scene from their Nativity play in the second decade of December 2023. The three kings, played by Jack Rigby, Santos Basilnomo and Tommy Leggett, pretended to follow a star on South Beach, a stone’s throw from the school. (Photo by Joann Randles/Cover Images)

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)