By Albert Bates, originally published by The Great Change
Excerpt from Optimized Potentials for Soil Sequestration of Atmospheric Carbon, Bates, et al.: …a reversal of carbon dioxide and other greenhouse gases is feasible using a socially responsible, economically productive and ecologically restorative agroforestry system we called “Climate Ecoforestry.” This system, if carried to the scale of 300 megahectares (about 1.2 million square miles, or tree-planting an area roughly the size of four Frances or five Spains) every year for the next 25 years, we could achieve the cumulative storage of 667 PgC (gigatons of carbon) required to bring atmospheric CO2 back to pre-industrial 250 ppm (parts per million). Were nations to collectively reduce fossil fuel emissions in line with the Paris Agreement, the reduction to 250 ppm could be achieved by year 37. In all cases, carbon would be stored in the world’s soils and living biomass and could provide many additional benefits beyond sequestration. (END EXCERPT)
Is there enough land for all that conversion to field and forest? Four Frances or five Spains. Per year? Well, it turns out, we do have that much, sitting at the margins, wrecked by bad land use practices, being slowly desertified by climate change, or otherwise neglected and abandoned.
Scientists have estimated that the amount of underused land immediately available for ecological restoration is at least 1.5 Gha (1.5 billion hectares or 30 Spains) worldwide [Smith et al. 2012]. That gives a 5-year start on climate ecoforestry at full scale and gets you to the step-harvest stage, although naturally, the ramp-up would proceed gradually. We are hopeful that once the causes and effects of climate change, and the eco-agroforestry benefits and increased soil productivity, become better known, large numbers of people will mobilize and allow parts of their landholdings to convert, and over a few decades that could reach the required 4.8 Gha needed, by our estimate, to restore pre-industrial equilibrium.
Hans-Peter Schmidt, provided a spectacular webinar for the International Biochar Initiative that reviewed a number of his recent publications and some still in progress. He was able to reduce the land required to be used for climate regeneration by a third to a half. The significance was underscored in a meeting I attended a day later by the advisory and supervisory boards of the Ecosystem Restoration Camp movement. ERC envisions 1 million people engaged in ecosystem regeneration camps within a decade. The first is already running in Spain and another 70 around the world are anticipated to launch. The IBI also has a big number goal — one billion tons of biochar produced per year within 50 years. The two numbers go very well together. And yet, they are not nearly enough. We will all need to raise ambition.