The world’s vast oceans, glacial ice sheets and northern permafrost are poised to unleash disaster, including drought, floods, hunger and destruction, unless dramatic action is taken against human-caused carbon pollution and climate change, warns a leaked draft of a major U.N. report.

The Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC) sounds alarm bells over declines in fish stocks, plus “a hundred-fold or more increase in the damages caused by superstorms, and hundreds of millions of people displaced by rising seas,” according to news agency Agence France-Presse (AFP), which obtained a copy of the 900-page draft report.

Freshwater supplies…