re: Is there proof that CO2 causes warming?

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i've never seen an article about smog and CO2 in the same context. even the dumbest of humans can be explained that when you exhale you don't see smog coming out of your mouth. thus smog and CO2 and global warming are stupid to talk about in the same sentence.

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BEIJING — Chinese leaders, grappling with some of the world’s worst air pollution, have long assumed the answer to their woes was gradually reducing the level of smog-forming chemicals emitted from power plants, steel factories and cars.

But new research suggests another factor may be hindering China’s efforts to take control of its devastating smog crisis: climate change.

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