The droughts and floods caused by climate change will put millions of people on the move, first into crowded and combustible cities, and then across borders. Russia and Canada may be happy to receive them as vast new tracts of land open up, but many other parts of the world are already crowded, which spells conflict.
气候变化造成的干旱和洪水将使数百万人流离失所，首先抵达拥挤嘈杂的城市，之后越过边境进入邻国。俄罗斯和加拿大或许因为有大片土地而乐于接纳，但世界其他地区已经非常拥挤，正是因为拥挤引发了冲突。