The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Rising carbon dioxide levels leads to global warming. The industrialized world has been the main protagonist given that carbon dioxide lasts about 100 years in the atmosphere, but as the developing nations become increasingly mechanized and urbanized, the balance is shifting. Indeed, the carbon emissions of Asia more than doubled from 1990 onwards.
Developing countries （） more carbon emissions than before.