Barker noted that raising animals for food is one of the largest sources of carbon dioxide and the single largest source of both methane and nitrous oxide emissions.
巴克提到饲养动物作为食物是二氧化碳的一种主要来源，并且是甲烷和氧化亚氮排放的唯一主要来源。
The current trend of global warming is pushing Earth back from its ice Age "icehouse" conditions-with large ice sheets and many glaciers-to a "greenhouse" with little ice overall, Barker noted.
当前全球变暖的趋势又促使地球由“冰室”——有许多大冰原和冰川，转变为“温室”——冰量总体上减少。巴克尔说。
The current trend of global warming is pushing Earth back from its ice Age "icehouse" conditions-with large ice sheets and many glaciers-to a "greenhouse" with little ice overall, Barker noted.
当前全球变暖的趋势又促使地球由“冰室”——有许多大冰原和冰川，转变为“温室”——冰量总体上减少。巴克尔说。
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