Photo: © John Rae
Corn is our country’s biggest crop economically and takes up nearly one-third of U.S. cropland. It is a pillar of our food production system – a key ingredient in everything from drinks, sauces and snack foods to dairy products, fuel and meat.
So when news about corn’s risky future pops up, we should all take note, and the entire agricultural supply chain should work toward solutions.
Water & Climate Risks Facing U.S. Corn Production, produced by the nonprofit sustainability advocate Ceres, is the latest analysis to sound the warning bell.
Last year U.S. corn growers harvested a record 14 billion bushels of corn, making them among the most productive farmers in the world (this year’s harvest is expected to be huge as well). But climate change and groundwater depletion are threatening to undermine corn’s success as global demand increases. Inefficient fertilizer use is compounding the problem.
This September, a new crop will be made available to rice producers: carbon offsets.
Fertilizer use is key to increasing the productivity necessary for farms to feed rising populations. However, not using the right amount in the right place at the right time is one of the biggest threats to a stable climate. Nitrogen fertilizer not used by crops emits nitrous oxide, a heat-trapping gas 300 times more powerful than carbon dioxide. It also contaminates water supplies, causes algae blooms downstream and erodes soil health.
There’s a growing excitement around spreading compost on rangelands to help fight climate change. Over the past four years we have learned that grazed rangelands are really good at pulling carbon out of the air and sequestering it in the soil below. And if you add compost just one time, you can capture carbon dioxide from the atmosphere for more than seven years. Plus, you’ll increase both the quality of the grasses and the ability of the soils to hold water. If we scaled this to just 5 % of California’s rangelands, we could capture approximately 28 million metric tons of carbon dioxide per year, which is about the same as the annual emissions from all the homes in California.