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Economist: It is generally less expensive to lower carbon dioxide emissions by building new low-emission...

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Economist: It is generally less expensive to lower carbon dioxide emissions by building new low-emission power plants than by renovating existing ones. Therefore, developed nations that have little need to build new power plants can most efficiently help to lower global emissions by subsidizing the construction of new low-emission power plants in rapidly developing nations where many power plants are being constructed.

In order to evaluate the strength of the economist's argument, it would be most helpful to know which of the following?

A.

How much it would cost developed nations to lower global carbon dioxide emissions by renovating their own existing power plants

B.

What, if any, methods of lowering carbon dioxide emissions are more efficient than building new low-emission power plants

C.

Whether any developed nations have subsidized efficient new low-emission power plants in rapidly developing nations

D.

How many rapidly developing nations are constructing new tow-emission power plants

E.

Why It is less expensive to tower carbon dioxide emissions by building new low-emission power plants than by renovating existing ones

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