This article was amended on 19 and 25 August 2022 to remove the suggestion that there are boreal forests in Greenland. Also, an earlier version said the International Organization for Migration “estimates that there could be as many as 1.5 billion environmental migrants in the next 30 years”; in fact, the IOM has cited estimates of up to 1 billion environmental migrants in this period. To read the article in The Guardian click here. Waste Management Hierarchy https://ie-rm.org/the-century-of-climate-migration-why-we-need-to-plan-for-the-great-upheaval/