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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And digging holes to plant saplings releases greenhouse gases from the soil.

为种植小树而挖坑也会从土壤中释放温室气体。

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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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The process releases some carbon dioxide, but Rajan Vempati says it would be reabsorbed into the soil naturally.

VOA: special.2009.12.01

And as it breaks down, it naturally releases nitrogen into the soil.

VOA: special.2010.06.01

Clearing forest and digging up soil releases lots of carbon into the atmosphere the very thing biofuels are supposed to be helping to prevent.

FORBES: U.S., Europe Going Opposite Way On Biofuels

Digging up contaminated soil releases odours previously trapped underground.

BBC: Hauxton factory

Moreover, soil containing biochar releases less methane and less nitrous oxide than its untreated counterparts, probably because the charcoal acts as a catalyst for the destruction of these gases.

ECONOMIST: Biochar could enrich soils and cut greenhouse gases as well