Obesity, undernutrition and climate change are the biggest threats to the world population, linked by profit motives and policy inertia, a top commission said Sunday, calling for a binding plan and trillions of dollars to thwart the dangers.

A $1 billion fund and action strategies targeting food policy and production are needed urgently to support health, the environment and economic well-being, said the report by the Lancet Commission on Obesity, a panel of experts in agriculture, economics, human rights and other fields.

The three problems of obesity, undernutrition and climate change are intertwined by methods of agricultural production, transport, urban design and land use that will take an enormous toll on the population and planet, the commission said.