The World Resources Institute has posted a really well-done interactive visualization on the history and the sources of human-caused CO2 emissions. Check it out:
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One uncomfortable fact that is made very clear by this: The U.S. has been the biggest emitter for a long, long while. China’s recent ascension shouldn’t distract from America’s enormous share of the responsibility for this problem (which, ironically, will probably impact America least, at least at first).