Sports emissions could push Earth past global warming limits
The system to feed Earth’s 7.7 billion people accounts for nearly a third of global total greenhouse gas emissions, including from land clearing and deforestation, fertiliser use and livestock.
Researchers in the United States and Britain said the only way to avert devastating levels of warming would be to transform what we eat, how it is produced, and the amount we waste.
“Our work shows that food is a much greater contributor to climate change than is widely known,” said co-author Jason Hill, a professor in the Department of Bioproducts and Biosystems Engineering at the University of Minnesota.
“Fortunately, we can fix this problem by using fertiliser more efficiently, by eating less meat and more fruits, vegetables, whole grains and nuts, and by making other important changes to our food system.”
The study in the journal Science forecasts future food system emissions using expected trends in population growth, dietary changes and the additional amount of land thought to be needed to feed the world.
The authors found that, if left unaddressed, these future food-related emissions would by themselves push Earth above the 1.5 degrees Celsius warming threshold — seen as the guardrail for avoiding devastating climate impacts — by 2050.
By the end of the century, they would lift temperatures to nearly 2C above preindustrial levels — the limit set in the 2015 Paris Agreement.
Unsustainable appetite
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