In the United States, cattle emit about 5.5 million tonnes of methane per year into the atmosphere, accounting for 20 percent of U.S. methane emissions, the Environmental Protection Agency says. In New Zealand, emissions from agriculture comprise about half of all greenhouse gas emissions.
But what worries Singer most is a rapid release of methane stored in sub-polar permafrost or in huge methane hydrate deposits under the sea. While this has not happened, some scientists suggest it might occur in a warmer world.
"If methane hydrates leak, then we're gone, then it's over."
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In the United States, cattle emit about 5.5 million tonnes of methane per year into the atmosphere, accounting for 20 percent of U.S. methane emissions, the Environmental Protection Agency says. In New Zealand, emissions from agriculture comprise about half of all greenhouse gas emissions.
