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It could also be that turkey populations overshot their carrying capacity in the '80s and '90s and are now declining to a “new normal,” Kaminski said.

But it was the Sierra Club, influenced by its first executive director, David Brower, that emerged as a leading proponent of the notion that the earth had a carrying capacity — that there was an optimum number for the planet’s population to be held at.

The population, then at around 211 million, continued to expand, and many who at first worried for the carrying capacity of the planet became preoccupied with walling off the country and keeping the global population at bay.

Having lost the backing of the Sierra Club, America’s anti-immigration movement turned more explicitly to climate change — and to one of Zuckerman’s Sierra Club colleagues, Leon Kolankiewicz, an environmental planner versed in sprawl and impact studies and a longtime proponent of the idea that the planet had a limited carrying capacity.

Dani Clode, a collaborator within Professor Makin's lab, has developed the Third Thumb, an extra robotic thumb aimed at increasing the wearer's range of movement, enhancing their grasping capability and expanding the carrying capacity of the hand.