5 Major Crops In The Crosshairs Of Climate Change

Climate change is coming like a freight train, or a rising tide. And our food, so dependent on rain and suitable temperatures, sits right in its path.

The plants that nourish us won’t disappear entirely. But they may have to move to higher and cooler latitudes, or farther up a mountainside. Some places may find it harder to grow anything at all, because there’s not enough water.

Here are five foods, and food-growing places, that will see the impact.

Wheat

Wheat, source of bread and a foundation of life in much of the world, will suffer from hotter temperatures — and the country where the impact may be greatest also is among least well-equipped to cope with a shortfall. India is likely to see a large drop in wheat production due to heat stress — about 8 percent if average global temperatures rise by 1 degree Celsius, according to one recent study. Temperatures are expected to rise more than that; according to a recent report from the U.N. Intergovernmental Panel on Climate Change, limiting climate change to 1.5 degrees Celsius will require heroic and dramatic action. It will take significant cuts in greenhouse gas emissions within 15 years, plus efforts to recapture some of the carbon that’s already been emitted, perhaps by planting new forests.

Globally, though, wheat may not be in short supply in a warmer world. Russia, which is already a major wheat exporter, may be able to expand the amount of land devoted to this crop.

Peaches

Despite Georgia’s claim to be the Peach State, California is the country’s biggest peach producer. Farmers there grow about half of the country’s fresh peaches, and almost all of the fruit that’s canned and processed in other ways.

Many fruit trees, including peaches, have a peculiar requirement. If they don’t experience enough chill during wintertime, they get confused and don’t bloom properly. No bloom, no harvest. The peach trees currently grown in California’s Central Valley require about 700 “chilling hours” during the winter. But scientists are predicting that by the end of the century, only 10 percent of the valley will reliably see that much chilling. And even if plant breeders create peach varieties that need less chilling, there’s another problem: Peach trees also yield less fruit when it gets too hot in summertime.

Coffee

Coffee can’t take freezing temperatures, but it doesn’t like extreme heat, either — at least the highly prized Arabica type doesn’t. So it’s mainly grown on relatively cool mountainsides in the tropics. Brazil is the biggest coffee producer in the world, by far, but as the globe warms up, most of its main coffee-growing regions probably won’t be suitable for growing this crop anymore, due to heat as well as more frequent rainstorms. Coffee could move to cooler parts of the country, but researchers don’t think those new growing areas will make up for what’s lost.

Meanwhile, rising temperatures could threaten native coffee trees that grow wild in the forests of Ethiopia and central Africa. The wild trees represent an irreplaceable storehouse of coffee’s original genetic diversity. The world’s commercial coffee trees are genetically very similar to each other, and those genetically diverse wild trees could be the source of genetic traits that plant breeders may need in order to create commercial trees that can thrive in tomorrow’s climate. Some of the wild trees, however, are preserved in “gene banks” in Ethiopia and Latin America.

For the full story by Dan Charles of National Public Radio, visit the NPR website here. 

Photo credits: 1&3-Heather Kim/NPR; 2-Mary Mathis and Heather Kim/NPR