Every time the United Nations climate negotiations get under way, media stories appear about the carbon emissions generated as thousands of government officials, environmentalists and scientists fly in from around the world. Similar questions have been raised about major environmental-science conferences, such as the Fall Meeting of the American Geophysical Union (AGU), which last year drew an astounding 24,000 people. But rarely does this discussion move beyond the obvious. It can indeed seem a bit disingenuous that people who are trying to understand and protect the planet will engage in such a high-carbon activity as aviation, but what is to be done?
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