A Kashmiri woman walks on a footbridge as it rains in Srinagar, June 24, 2015. This year's monsoon rains in India are officially forecast to be only 88 percent of the long-term average. (Photo by Danish Ismail/Reuters)

Women walk past a mannequin with a covered face as they shop ahead of the Muslim festival of Eid-al-Adha in Aleppo, Syria September 23, 2015. (Photo by Hamid Khatib/Reuters)

A young hunter rests next to his tamed golden eagle during an annual hunters competition at Almaty hippodrome, Kazakhstan February 9, 2018. (Photo by Shamil Zhumatov/Reuters)

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)

A couple embraces at the railway station in Kramatorsk, on May 20, 2023, amid the Russian invasion of Ukraine. (Photo by Sergey Shestak/AFP Photo)

Walkers marvel at a fog bow over Curbar Edge, Derbyshire in the last decade of October 2023. The phenomenon is similar to a rainbow, but because the water droplets that cause fog are so small, its colours are very weak. (Photo by Richard Bowring/Animal News Agency)

Papier-mache sculptures, also known as “ninots”, burn during the “Nit de la Crema” (Fire Night) of the Fallas Festival in Valencia, eastern Spain, 19 March 2024. Fallas is a fortnight-long fiesta in which installations of parodic papier-mache, cardboard, and wooden sculptures are traditionally burnt every year on the last day of the event in the so-called “Crema” to end the festivities. (Photo by Biel Alino/EPA/EFE)

The lightest material ever made has been produced by a team of scientists in China, a Chinese university announced.