U.N. climate chief Christiana Figueres speaks during an interview at the World Economic Forum in Davos, Switzerland, on Jan. 22, 2014. AP 

Economic Systems: The alarmists keep telling us their concern about global warming is all about man's stewardship of the environment. But we know that's not true. A United Nations official has now confirmed this.

At a news conference last week in Brussels, Christiana Figueres, executive secretary of U.N.'s Framework Convention on Climate Change, admitted that the goal of environmental activists is not to save the world from ecological calamity but to destroy capitalism.

"This is the first time in the history of mankind that we are setting ourselves the task of intentionally, within a defined period of time, to change the economic development model that has been reigning for at least 150 years, since the Industrial Revolution," she said.

Referring to a new international treaty environmentalists hope will be adopted at the Paris climate change conference later this year, she added: "This is probably the most difficult task we have ever given ourselves, which is to intentionally transform the economic development model for the first time in human history."

The only economic model in the last 150 years that has ever worked at all is capitalism. The evidence is prima facie: From a feudal order that lasted a thousand years, produced zero growth and kept workdays long and lifespans short, the countries that have embraced free-market capitalism have enjoyed a system in which output has increased 70-fold, work days have been halved and lifespans doubled.

Figueres is perhaps the perfect person for the job of transforming "the economic development model" because she's really never seen it work. "If you look at Ms. Figueres' Wikipedia page," notes Cato economist Dan Mitchell: Making the world look at their right hand while they choke developed economies with their left.