BBC.地平线.2020.从七十七亿人口开始/BBC.地平线.2020.哈勃望远镜是由等主演的未知片，2020年播出。According to the UN, it is predicted that the human population could reach ten billion people by the year 2050. For broadcaster and naturalist Chris Packham, who has dedicated his life to championing the natural world, the subject of our growing population and the impact it is having on our planet is one of the most vital – and often overlooked – topics of discussion in an era of increasing enviro…