"Climate change is a problem that can no longer be left to a future generation," he said in front of the White House.

When he spoke to Congress, he again urged America to use its great innovation and leadership to "avert the most serious effects of the environmental deterioration caused by human activity."

Francis wants action. But what would it cost?

The typical American family would end up spending $700 to $1,100 more a year.

That's according to the Congressional Budget Office.

Estimates vary widely, but the non-partisan CBO report is seen as a pretty fair projection. It's possible those costs could end up being a lot less if the government gave families subsidies to help alleviate the hit.

But the bottom line is it will cost people and businesses a lot.

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