Ruins of the ancient Maya city Chichen Itza Shutterstock/Aleksandr Medvedkov
Around the world, severe droughts are disrupting life for millions of people. In south-western North America and the Pacific coast of South America, worst-in-a-millennium megadroughts have created a slow-moving disaster, as reservoir levels decline and whole regions prepare to make unprecedented cuts to make up the shortfall.
Megadrought in North America
This story is part of our Parched Earth series about the ongoing megadrought in south-western North America, the worst such drought in more than 1200 years
In the Horn of Africa, the worst drought in 40 years has put more than 7 million people at risk of famine. In Europe and China, drought and heat have made rivers impassable and tanked energy output at dams and nuclear plants.
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Global warming has made such droughts more severe and frequent in many places, but these exceptionally bad droughts – or megadroughts – are not only a modern phenomenon. According to a recent review, megadroughts have occurred on every continent except Antarctica over the past 2000 years.
A look at some of the worst droughts of the past can help us to prepare for the megadroughts of the future. Below, explore how megadroughts have changed the landscape and altered human societies for the last two millennia.
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