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Home Topics Environment

Food systems offer huge opportunities to cut emissions

Greenhouse gases from food production are systematically underestimated, researchers say

by Kevin Krajick
June 16, 2021
in Research, Agriculture
Reading Time: 4 mins read
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A new global analysis says greenhouse gas emissions from food systems have long been systematically underestimated. It points to major opportunities to cut them.

The authors estimate that activities connected to food production and consumption produced the equivalent of 16 billion metric tons of carbon dioxide in 2018—one third of the human-produced total, and an 8 percent increase since 1990.

A companion policy paper highlights the need to integrate research with efforts to reduce emissions.

The papers, developed jointly by the UN Food and Agriculture Organization (FAO), NASA, New York University and experts at Columbia University, are part of a special issue of Environmental Research Letters on sustainable food systems.

The Center on Global Energy Policy has also produced a detailed guide to food systems and climate, and a related video, both geared to the general public.

The lead author of the analysis, Francesco Tubiello, heads the environment statistics unit at FAO. He said the study shows that food production represents a “larger greenhouse-gas mitigation opportunity than previously estimated, and one that cannot be ignored in efforts to achieve the Paris Agreement goals.”

He said emissions inventories that countries currently report to the United Nations Framework Convention on Climate Change poorly characterise food systems, and underestimate their contribution to climate change.

The study provides country-level datasets that are being refined ahead of the UN’s Food Systems Summit, to be held in July. It considers emissions linked not just to production of livestock and crops, but from land-use changes at the boundary between farms and natural ecosystems, and from related manufacturing, processing, storage, transport and waste disposal.

The companion policy piece calls for better scientific understanding of the processes through which greenhouse gases are emitted from all phases of food production and consumption. It says that the food system has a major role to play in mitigating climate change.

The lead author of that paper, Cynthia Rosenzweig of Columbia University’s Earth Institute and the NASA Goddard Institute for Space Studies, said, “Science and policy domains have often been siloed in academia. We propose a ‘double helix’ of interactive research by scientists and policy experts that can deliver significant benefits for both climate change and the food system.”

“Conversion of nature to agriculture remains the largest emissions source”

“The food system and the climate system are deeply intertwined,” said coauthor David Sandalow, a fellow at Columbia’s Center on Global Energy Policy. “Better data can help lead to better policies for cutting emissions and protecting the food system from a changing climate.”

Programs and policies to mitigate climate change must consider the impact on the more than 500 million smallholder households around the world, say the authors. This issue is particularly acute in the least-developed countries, where relatively larger shares of the population rely on agriculture for their livelihoods, they say.

“To achieve a net-zero future, we need to understand better the interplay between the food system and emissions in developing countries where populations are growing, poverty is diminishing, and incomes are rising,” said Philippe Benoit, an adjunct senior research scholar at the Center on Global Energy Policy.

One emergent theme: optimal mitigation strategies will require a focus on activities both before and after farm production, ranging from the industrial production of fertilizers to refrigeration at the retail level. Emissions from these activities are growing fast.

“Agriculture in developed countries emits large quantities of greenhouse gases, but their share can be obscured by large emissions from other sectors like electricity, transportation and buildings,” said Matthew Hayek, an assistant professor in environmental studies at New York University and coauthor of both pieces.

“Looking at the entire food system can not only illuminate opportunities to reduce emissions from agriculture, but also improve efficiency across the whole supply chain with technologies such as refrigeration and storage.”

The study found that while total food-systems emissions rose from 1990 to 2018, growing populations and changing technologies meant that per capita emissions actually decreased, from the equivalent of 2.9 metric tons to 2.2 metric tons per person. But per capita emissions in developed countries, at 3.6 metric tons per person in 2018, were nearly twice those in developing countries.

The conversion of natural ecosystems to agricultural croplands or pastures remained the largest single emissions source over the study period, at nearly 3 billion metric tons per year. But it declined significantly over time, by over 30 percent, possibly in part because we are running out of land to convert.

On the other hand, global emissions from domestic food transportation have increased by nearly 80 percent since 1990, to 500 million tons in 2018. Those emissions have nearly tripled in developing countries. And emissions generated by food system energy use, largely carbon dioxide from fossil fuels along the supply chain, amounted to over 4 billion tons in 2018, an increase of 50 percent since 1990.

Read the authors’ guide to food systems and climate

This article first appeared in State of the Planet. 

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Tags: Greenhouse gas emissionsColumbia University; Food and Agriculture Organization; NASA
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Kevin Krajick

Kevin Krajick

Kevin Krajick is the Earth Institute's senior editor for science news. He grew up in the Catskill Mountains and Hudson Valley of upstate New York, where he started in journalism at his high-school newspaper. He has since reported from all 50 U.S. states and 30-some countries, covering science, criminal justice, immigration and other subjects. His work has been featured in National Geographic, Newsweek, The New Yorker, Science, Smithsonian and many other publications. He was a 1981 finalist for the National Magazine Award for Public Service for his reporting on organized crime's links to the toxic waste-disposal industry. Among other honors, he is two-time winner of the American Geophysical Union's Walter Sullivan Award for Excellence in Science Journalism, and his work has been featured repeatedly in the yearly book "Best American Science and Nature Writing." His 2001 book "Barren Lands" is the true account of how prospectors discovered diamond mines in Canada's remote far north. Krajick holds degrees in comparative literature and journalism from Columbia University.

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