Game over on global warming?

Everybody in the United States could switch from cars to bicycles.

The Chinese could close all their factories.

Europe could give up electricity and return to the age of the lantern.

But all those steps together would not come close to stopping global warming.

A landmark report from the United Nations’ Intergovernmental Panel on Climate Change, released Friday, warns that there is so much carbon dioxide and other greenhouse gases in the atmosphere that even if concentrations held at current levels, the effects of global warming would continue for centuries.

There is still hope. The report notes that a concerted world effort could stave off the direst consequences of global warming, such as widespread flooding, drought and extreme weather.

Ultimately eliminating the global warming threat, however, would require radical action.

LA Times