(FILES) This photo taken on January 28, 2021 shows workers making medical masks at a workshop of a company which produces medical protective equipment in Jishou, in central China's Hunan province. Global warming. Disappearing plant and animal species. Fertile land turning to desert. Plastic in the oceans, on land, and the air we breathe. These urgent environmental challenges will be in the spotlight over the next few months as the UN hosts four major sessions to address key threats to the planet. (Photo by AFP) / China OUT