A study by Covey & Megonigal indicates individual trees can emit on the order of a gram of methane per hour, or about 1/10th as much CH4as a cow, but does not directly compare the global flux from forests and cattle.
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That omission must come as a relief to UN carbon offset officials running the Trillion Tree Campaign, as a Yale study suggests Earth's three trillion trees already outnumber its cattle 3,000 to 1.
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