Violent storms, scorching heat waves, and infectious diseases could ravage the world's ecosystems. By the end of the 21st century, humans may need to escape from the Earth's unlivable conditions.
猛烈的风暴、炙热的热浪和传染病都可能肆虐全球生态系统。或许到21纪末,人类需要从地球上这个不适宜居住的环境中逃离。