Soil tilling releases carbon dioxide, and delivery vehicles emit exhaust.

耕作翻土会释放二氧化碳，而运输车辆会排放废气。

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Tilling the soil involves an early start.

翻耕土壤需要及早动手。

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Tilling also releases carbon dioxide from the soil into the atmosphere. No-till keeps carbon in the soil and avoids the release of heat-trapping gases from motorized equipment.

耕作还会将土壤中的二氧化碳释放到大气中，而免耕能够保持住土壤中的碳，并且避免机械设备释放吸热气体。

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Experts say some methods of tilling turning the soil to prepare for planting also release harmful carbon dioxide.

VOA: special.2010.01.05

As a congressman, senator and vice president, he worked relentlessly toward creating disincentives to the development, testing and use of innovative, safe and potentially important technologies--especially biotechnology applied to agriculture, which has been instrumental in enhancing yields, reducing losses from pests and encouraging farming practices that prevent carbon dioxide release from tilling soil.

FORBES: Commentary

Or even tilling the soil, like our more proximate ancestors.

FORBES: Pepsi's New Challenge

The concept: When crops are planted without tilling, the soil holds more carbon, which means less goes up into the atmosphere.

NPR: Can Dirt Really Save Us From Global Warming?