If man-made greenhouse gas emissions are approaching a critical threshold, as the UN's climate experts suggest, the time spent on projects that abate relatively rare gases, but command artificially large profits, may prove a costly distraction.

ECONOMIST: The treaties that pay you to pollute

Throughout his political career, Gore was a one-man calamity for agricultural innovations that could reduce greenhouse gas emissions and for an agricultural commodity supply-demand balance that would keep food prices low.

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The U.S., the biggest emitter of man-made carbon dioxide, produces 36.1 percent of the gas, the EU accounts for 24.2 percent, and Japan is responsible for 8.5 percent.

CNN: U.N. bids to rescue climate deal

Half action-RPG, half real-time strategy, the game is the latest brainchild of Chris Taylor, the man behind Gas Powered Games.

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