Governments spends trillions to fight climate change, but Environmentalist Bjorn Lomborg says many of these policies are a waste of money.

For saying this, Lomborg has been called "the devil." The Danish government even targeted him for his views on climate change.

"I'm not trying to do something that's immoral," he tells me, "I'm simply trying to make sure that we get it right."

Lomborg says there are better things society should spend money on like maternal and newborn health and improving education.

In this podcast he explains why.