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Humans must immediately implement a series of radical measures to halt carbon emissions or prepare for the collapse of entire ecosystems and the displacement, suffering and death of hundreds of millions of the globe’s inhabitants, according to a report commissioned by the World Bank. The continued failure to respond aggressively to climate change, the report warns, will mean that the planet will inevitably warm by at least 4 degrees Celsius (7.2 degrees Fahrenheit) by the end of the century, ushering in an apocalypse.

The 84-page document,”Turn Down the Heat: Why a 4°C Warmer World Must Be Avoided,” was written for the World Bank by the Potsdam Institute for Climate Impact Research and Climate Analytics and published last week. The picture it paints of a world convulsed by rising temperatures is a mixture of mass chaos, systems collapse and medical suffering like that of the worst of the Black Plague, which in the 14th century killed 30 to 60 percent of Europe’s population.

A planetwide temperature rise of 4 degrees C-and the report notes that the tepidness of the emission pledges and commitments of the United Nations Framework Convention on Climate Change will make such an increase almost inevitable-will cause a precipitous drop in crop yields, along with the loss of many fish species, resulting in widespread hunger and starvation. Hundreds of millions of people will be forced to abandon their homes in coastal areas and on islands that will be submerged as the sea rises. There will be an explosion in diseases such as malaria, cholera and dengue fever. Devastating heat waves and droughts, as well as floods, especially in the tropics, will render parts of the Earth uninhabitable. The rain forest covering the Amazon basin will disappear. Coral reefs will vanish. Numerous animal and plant species, many of which are vital to sustaining human populations, will become extinct. Monstrous storms will eradicate biodiversity, along with whole cities and communities. And as these extreme events begin to occur simultaneously in different regions of the world, the report finds, there will be “unprecedented stresses on human systems.” Global agricultural production will eventually not be able to compensate. Health and emergency systems, as well as institutions designed to maintain social cohesion and law and order, will crumble. The world’s poor, at first, will suffer the most. But we all will succumb in the end to the folly and hubris of the Industrial Age. And yet, we do nothing.