Under the new Obama administration, she now advises Hillary Clinton.

“We need to continue to decrease the growth rate of the global population; the planet can’t support many more people,” Dr Fedoroff said, stressing the need for humans to become much better at managing “wild lands”, and in particular water supplies.

Pressed on whether she thought the world population was simply too high, Dr Fedoroff replied: “There are probably already too many people on the planet.”