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Their longer growing seasons and more extensive root systems make them more competitive against weeds and more effective at capturing nutrients and water.

Farmers don’t have to replant the crop each year, don’t have to add as much fertilizer and pesticide, and don’t burn as much diesel in their tractors.

An expanding group of plant breeders around the world is working to change that.

Although annual grain crops have been with us for thousands of years and have benefited from many generations of breeding, modern plant breeding techniques provide unprecedented opportunities to develop new crops much more quickly.

Their production emits significant greenhouse gases, contributing to climate change that can in turn have adverse effects on agricultural productivity.

These are not the inevitable consequences of farming.

Even in regions best suited for annual crops, such as the Corn Belt, soil carbon and nitrogen levels decreased by 40 to 50% or more after conversion from native plants to annuals.

Global data for maize, rice, and wheat indicate that they take up only 20 to 50% of the nitrogen applied in fertilizer; the rest is lost to surrounding environments.

Yet perennial grain crops promise much larger payoffs for the environment and food security and have similar timelines for widespread application. Additionally, the farm bill could include support for the development of perennial breeding programs.

Such images run counter to those of environmental destruction and chronic hunger and seem disconnected from the challenges of climate change, energy use, and biodiversity loss.

Agriculture, though, has been identified as the greatest threat to biodiversity and ecosystem function of any human activity.

The earliest cultivators had long collected seed from both annual and perennial plants; however, they found the annuals to be better adapted to the soil disturbance and annual sowing they had adopted in order to maintain a convenient and steady supply of grains harvested from the annual plants.

Although some of the wild annuals first to be domesticated, such as wheat and barley, were favored because they had large seeds, others had seeds comparable in size to those of their wild perennial counterparts.

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(Photo by Dimitrios Kambouris/Getty Images for Victoria's Secret)Model Izabel Goulart from Brazil walks the runway during the 2015 Victoria's Secret Fashion Show at Lexington Avenue Armory on November 10, 2015 in New York City.

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