A demonstrator kicks a tear gas canister during clashes with riot police near the Place de la République after the cancellation of a planned climate march. Eric Gaillard /Reuters /Landov hide caption

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Imagine a bar without the booze. Delegates wrangling in Bonn, Germany, this week have to figure out soon how to cover the world's climate bill. Oliver Berg/DPA/Landov hide caption

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Delegates took their seats during the plenary session at the Bonn climate change conference on March 10, 2014. Negotiations resume this week; by the end of the year, the U.N. hopes to have forged a new global agreement. UNclimatechange/Flickr hide caption

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ADP Co-chairs Daniel Reifsnyder (left) and Ahmed Djoghlaf (center) say their negotiation work is difficult but worth it. "We only have one planet, you know," Reifsnyder says. "We have to protect it." Courtesy of IISD/ENB hide caption

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Country representatives listen to opening remarks at the start of the United Nations' Conference of the Parties on Climate Change in Lima, Peru. Cris Bouroncle/AFP/Getty Images hide caption

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