Relocating farmland could turn back clock twenty years on carbon
emissions, say scientists

Date:
March 10, 2022
Source:
University of Cambridge
Summary:
Scientists have produced a map showing where the world's major food
crops should be grown to maximize yield and minimize environmental
impact. This would capture large amounts of carbon, increase
biodiversity, and cut agricultural use of freshwater to zero.



FULL STORY ========================================================================== Scientists have produced a map showing where the world's major food crops should be grown to maximise yield and minimise environmental impact. This
would capture large amounts of carbon, increase biodiversity, and cut agricultural use of freshwater to zero.


==========================================================================
The reimagined world map of agriculture includes large new farming
areas for many major crops around the cornbelt in the mid-western US,
and below the Sahara desert. Huge areas of farmland in Europe and India
would be restored to natural habitat.

The redesign -- assuming high-input, mechanised farming -- would cut the
carbon impact of global croplands by 71%, by allowing land to revert to
its natural, forested state. This is the equivalent of capturing twenty
years' worth of our current net CO2 emissions. Trees capture carbon as
they grow, and also enable more carbon to be captured by the soil than
when crops are grown in it.

In this optimised scenario, the impact of crop production on the world's biodiversity would be reduced by 87%. This would drastically reduce
the extinction risk for many species, for which agriculture is a major
threat. The researchers say that croplands would quickly revert back to
their natural state, often recovering their original carbon stocks and biodiversity within a few decades.

The redesign would eliminate the need for irrigation altogether, by
growing crops in places where rainfall provides all the water they need
to grow.

Agriculture is currently responsible for around 70% of global freshwater
use, and this causes drinking water shortages in many drier parts of
the world.

The researchers used global maps of the current growing areas of 25 major crops, including wheat, barley and soybean, which together account for
over three quarters of croplands worldwide. They developed a mathematical
model to look at all possible ways to distribute this cropland across the globe, while maintaining overall production levels for each crop. This
allowed them to identify the option with the lowest environmental impact.



==========================================================================
The study is published today in the journal Nature Communications Earth
& Environment.

"In many places, cropland has replaced natural habitat that contained
a lot of carbon and biodiversity - and crops don't even grow very well
there. If we let these places regenerate, and moved production to better
suited areas, we would see environmental benefits very quickly," said
Dr Robert Beyer, formerly a researcher in the University of Cambridge's Department of Zoology, and first author of the study. Beyer is now based
at the Potsdam Institute for Climate Impact Research (PIK), Germany.

Previous studies have identified priority areas for ecological
restoration, but this is the first to plot the relocation of agricultural
land to maximise long- term environmental benefits without compromising
food security.

While a complete global relocation of cropland is clearly not a scenario
that could currently be put into practice, the scientists say their
models highlight places were croplands are currently very unproductive,
but have potential to be hotspots for biodiversity and carbon storage.

Taking a pared-back approach and only redistributing croplands within
national borders, rather than globally, would still result in significant benefits: global carbon impact would be reduced by 59% and biodiversity
impact would be 77% lower than at present.



==========================================================================
A third, even more realistic option of only relocating the worst-offending
25% of croplands nationally would result in half of the benefits of
optimally moving all croplands.

"It's currently not realistic to implement this whole redesign. But even
if we only relocated a fraction of the world's cropland, focusing on
the places that are least efficient for growing crops, the environmental benefits would be tremendous," said Beyer.

The study finds that the optimal distribution of croplands will change
very little until the end of the century, irrespective of the specific
ways in which the climate may change.

"Optimal cropping locations are no moving target. Areas where
environmental footprints would be low, and crop yields high, for the
current climate will largely remain optimal in the future," said Professor Andrea Manica at the University of Cambridge, senior author of the paper.

The researchers acknowledge that relocating cropland must be done in a
way that is acceptable to the people it affects, both economically and socially. They cite examples of set-aside schemes that give farmers
financial incentives to retire part of their land for environmental
benefit. Financial incentives can also encourage people to farm in better suited locations.

The model generated alternative global distribution maps depending on
the way the land is farmed - ranging from advanced, fully mechanised
production with high-yielding crop varieties and optimum fertiliser and pesticide application, through to traditional subsistence-based organic farming. Even redistribution of less intensive farming practices
to optimal locations would substantially reduce their carbon and
biodiversity impacts.

While other studies show that if we moved towards more plant-based diets
we could significantly reduce the environmental impacts of agriculture,
the researchers say that in reality diets aren't changing quickly. Their
model assumed that diets will not change, and focused on producing the
same food as today but in an optimal way.

Many of the world's croplands are located in areas where they have a huge environmental footprint, having replaced carbon-rich and biodiversity-rich ecosystems, and are a significant drain on local water resources. These locations were chosen for historical reasons, such as their proximity
to human settlements, but the researchers say it is now time to grow
food in a more optimal way.


========================================================================== Story Source: Materials provided by University_of_Cambridge. The original
text of this story is licensed under a Creative_Commons_License. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Robert M. Beyer, Fangyuan Hua, Philip A. Martin, Andrea Manica, Tim
Rademacher. Relocating croplands could drastically reduce the
environmental impacts of global food production. Communications
Earth & Environment, 2022; 3 (1) DOI: 10.1038/s43247-022-00360-6 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/03/220310095952.htm

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