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Waste Management & Research, Vol. 26, No. 1, 61-69 (2008)
DOI: 10.1177/0734242X08088584
© 2008 International Solid Waste Association

The potential role of compost in reducing greenhouse gases

Enzo Favoino

Scuola Agraria del Parco di Monza, Monza, Italy, enzofavoino{at}alice.it

Dominic Hogg

Eunomia Research & Consulting, Bristol, UK

The contribution of the agricultural sector to emissions of climate change gases is becoming better understood. At the same time, the potential role of the sector as a means through which to tackle climate change, widely neglected in the past, is becoming more widely acknowledged. The absorption potential of agricultural soils could contribute significantly to constraining growth in greenhouse gas emissions, while also contributing to improvements in soil quality in some areas. In addition to the measures listed above, other benefits of compost application may have some relevance. Some of these measures include replacement of chemical fertilizers (implying avoidance of greenhouse gases related to their production) reduced use of pesticides (avoiding emissions associated with their production), improved tilth and workability (less consumption of fuels). Typically, life-cycle analyses (LCAs) exhibit limitations related to assessing the effects of `time-limited' carbon sequestration in soils. This has tended to obscure the potentially important effect of composting, in which biogenic carbon is held in soils for a period of time before the carbon is released. The paper seeks to understand these effects and offers comments on the contribution of biological treatments to tackling climate change issues. Key issues include the replacement of fertilizers, reduction of N2O emissions, and peat replacement.

Key Words: Composting • anaerobic digestion • biowaste • life-cycle assessment • climate change • carbon sequestration • wmr 1316—1


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