Agriculture might seem green by definition, but farming accounts for a lot of greenhouse-gas emissions when the entire food production system is taken into account. Typically, estimates of greenhouse-gas emissions from agriculture are around 11%-15% of global emissions. Estimates discussed earlier this week at the United Nations Climate Summit put that number closer to 50%. This is an important calculation as climate change issues come to the fore, with record greenhouse-gas emissions and international negotiations to halt that rise. The reason for the difference is that the 11%-15% estimates only take into account emissions from the farming part of agriculture, such as plowing and fertilizing. The U.S. Environmental Protection Agency’s 14% estimate, for example, includes emissions from agriculture’s mechanical equipment, soil management, enteric fermentation (which produces, say, belches from a cow), manure management, rice cultivation and field burning. It doesn’t include transport, food processing, packaging, and sale of agricultural products. The 43%-57% estimates, which are published in the United Nations Conference on Trade and Development‘s 2013 Trade and Environment Review, look at food production more broadly to also include emissions from land-use change and deforestation, as well as the processing, packaging, transport and sale of agricultural products. The estimates come from Grain, an international nonprofit research foundation that contributed to U.N. the report. It analyzed existing data on global emissions to determine the full extent of agriculture’s emissions. According to Ulrich Hoffmann, senior trade policy adviser to the director of the International Trade Division of the secretariat of UNCTAD and editor of its 2013 report, defining agriculture more broadly paints a better picture of the issue at hand. It all depends on how you define system coverage,” Mr. Hoffmann said. “If you look at agriculture like you would look at the steel industry, which includes all transport-related emissions, then the [50% agriculture emissions] figure is quite accurate. blogs.wsj/numbers/how-much-of-worlds-greenhouse-gas-emissions-come-from-agriculture-1782/
Posted on: Wed, 01 Oct 2014 01:35:11 +0000
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