Author: Cathy Watson | Published: December 13, 2017
Never has it been so pressing to address climate change. So let’s hurry to embrace a proven part of the solution. The radical (but not new) concept of agroforestry – be it integrating trees to create shade over coffee bushes, adding trees to Colombian cattle ranches, or managing and encouraging shea trees to flourish amid millet crops in the Sahel – must move to centre stage.
The Global Carbon Project estimates that 2017 will see a two percent rise in worldwide carbon dioxide emissions, reversing the downward trend of the previous few years.
Almost a quarter of these emissions come from agriculture and the conversion of forests and wetlands into farmland.
This year is also set to be one of the hottest three ever recorded, according to the World Meteorological Organization. And, unlike 2016, 2017 has managed this even without a temperature-boosting El Niño weather system.
Flash floods in Southeast Asia, drought in East Africa, and melting glaciers in Latin America are just three examples of the extreme weather events linked to climate change that affect all corners of the world.
This is, truly, a global disaster, and one largely of our own making.
Solution at hand
But we also have the power to mitigate global warming, through reducing emissions of CO2 and increasing its absorption by expanding or protecting “carbon sinks” such as forests.
One especially effective but still yet to be fully recognised mitigation strategy is agroforestry – the purposeful regeneration, planting, and maintenance of trees and woody bushes on farms and rangeland.
Already, almost a billion hectares of agricultural land across the world contains trees that farming families deliberately manage side by side with their crops and livestock. Around 1.2 billion people depend on these agroforestry systems.
The soil, vegetation, and biomass on every hectare of such land can capture 3.3 tonnes of carbon per year – much more than that captured by land without trees.
Recent research indicates that tree cover on agricultural land across the planet absorbs some 0.75 gigatonnes of carbon a year. That’s a sizable chunk of the 9.75 gigatonnes of CO2 the world emits annually.