How food and agriculture contribute to climate change

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By Leah Douglas

(Reuters) — Feeding the world is a big job, and the effort produces billions of  mets of emissions of greenhouse gases each year — around a third of the global total.

Despite the fact that food is a big climate problem, very little has been done so far to address it.

This year's U.N. climate conference in Dubai will be the first to dedicate a whole day to the question of how to reduce food's climate impact, and advocacy groups are pressing countries to come up with real solutions.

Here are some details about the sources of emissions from the food and agriculture sector:

HOW MUCH DOES OUR FOOD EMIT?

Global food systems accounted for 17 billion metric tonnes of carbon dioxide equivalent or 31% of human-made greenhouse gas emissions in 2019, according to the United Nations' Food and Agriculture Organization (FAO).

That includes emissions related to farming and land use, producing crops and livestock, household food consumption and waste, and energy used in farm and food processing and transportation, according to FAO.

Altogether, those sectors generated 21% of all the world's carbon dioxide, 53% of all methane and 78% of all nitrous oxide emissions globally, according to FAO.

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One the biggest contributors is livestock. Global livestock production generates around 14.5% of all anthropogenic GHG emissions, according to FAO.

Cattle are responsible for 65% of those emissions, largely as methane. When ruminant animals like cows and sheep digest food, they produce methane in the form of burps. Storage of manure, especially in large lagoons, also emits methane.

Emissions also come from producing and processing animal feed, including tilling land to grow crops, which releases carbon dioxide stored in the