solution_tropicalstapletrees01.jpg

Silhouettes of tropical staple trees with glowing sunset on horizon.
AfriPics.com / Alamy Stock Photo

Perennial Staple Crops

Support SinksLand SinksShift Agriculture Practices
15.45–31.26
Gigatons
CO2 Equivalent
Reduced / Sequestered
(2020–2050)
$83.13–190.25
Billion $US
Net First Cost
(To Implement Solution)
$-1.92–-0.85
Trillion $US
Lifetime Net
Operational Savings
$1.48–3.33
Trillion $US
Lifetime
Net Profit
Perennial staple crops provide important foods, such as bananas, avocado, and breadfruit. Compared to annual crops, they have similar yields but higher rates of carbon sequestration.

Solution Summary*

The dominant agricultural crops are annual—planted, harvested, and replanted every year. Perennials come back year after year, with similar yield and higher rates of carbon sequestration. Many have been cultivated and harvested for millennia, and some are critical to the world’s food supply today, particularly in the tropics.

Staple foods from trees include starchy fruits such as bananas and breadfruit, oil-rich fruits such as avocado, and nuts such as coconut and Brazil. Many legumes are perennial, including pigeon peas, mesquite, and carob. Africa abounds with staple tree crops: baobab, mafura, argan, and more. These trees can take root in forest-farms, multistrata agroforestry, or intercropping systems.

Tropical staple tree crops can reverse erosion and runoff and create higher infiltration rates for rainwater. They can be grown on steep slopes and in a wide range of soils. They require lower inputs of fuel, fertilizer, and pesticides, if any at all.

Today, 89 percent of cultivated land, about 3 billion acres, is devoted to annuals. Lands converted from annuals to perennial staples sequester, on average, 1.9 tons of carbon per acre every year for decades. What’s more, perennial staple tree crops can weather and thrive under conditions that annuals cannot—vital in a warming world.

* excerpted from the book, Drawdown
Impact:

Perennial staple crops currently grow on approximately 50 million hectares, mostly in the tropics. Their rate of sequestration is high at 3.34 tons per hectare per year. Expand this area by another 601-141million hectares by 2050 and they can sequester 15.4-31.3gigatons of additional carbon dioxide. Our analysis assumes that expansion only occurs on existing grassland, with no forest clearing. Because their yield is 2.4 times higher than annual staples—at 60 percent of the cost—savings are significant ranging from $1.4-3.3 trillion, with an establishment cost of $83-190 billion and lifetime operational cost of $848-1922 billion.