You may have heard by now about “climate-smart agriculture.” It’s the catchphrase that came out of the United Nations Climate Summit this week and the reason I was in New York to participate in a panel discussion on how to achieve food security for a growing population in a climate-changing world.
More than 20 governments and 30 organizations announced they would join the newly launched Global Alliance for Climate-Smart Agriculture, which aims to enable 500 million farmers worldwide to practice climate-smart agriculture. This is wonderful. But what does it mean in practice?
My colleagues and I have been asking ourselves this question since the concept was originally introduced by the UN’s Food and Agriculture Organization in 2010. Over the past four years, we’ve done some hard thinking on which practices, precisely, will get us to a point where we can keep pace with the food demands of a growing global population and increase the resiliency of our food systems to the harsh impacts of climate change.
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.