The French have lead the way recognizing Soil Carbons' value and committing to build Soil Carbon by 0.40% annually. Putting them on the road to Carbon Negativity before any industrialized country. 25 nations have signed on to 4p1000. 100 of the 196 countries in Paris submitted plans to reduce CO2 via agriculture, forestry and replacing soil carbon into their programmes.
http://4p1000.org/understand

A combination of Best Management Practices, (BMPs), for Agriculture, Grazing & Forestry with bioenergy systems which build soil carbon can deliver the giga-tons of carbon necessary into the soil sink bank.

Ag BMPs; 1 GtC, New Forest & BMPs; 1 GtC
Pyrolitic Bioenergy, Cooking Stoves; nearly 1/2 GtC
Industrial Pyrolitic Bioenergy; 2 GtC
Holistic Grazing; 2+ GtC

Over 6 GtC,
So soils & biota can do more than half the 10 GtC reduction job, feeding carbon to life instead of death.

Carbon Sequestration Cascade;
Each Black Carbon gram (biochar & humus) can increase Water Retention by 8 grams, and can support 10 grams of Green Carbon, which each can feed up to 10 more grams of fungal mycelium White Carbon growth

Carbon has been fundamental to life since the birth of our planet. It’s the source of all wealth and the conduit of all joy. Carbon cycles among and between billions of interconnected earthlings, whose fates teeter on the element’s return trip to the soil. Only the generous reciprocity inherent to life macrocycles can restore abundance and harmony to the planet of the living. May we celebrate a happy Intended Anthropocene, anointed in water & Soil rather than Oil and Blood.

The big problem in tropical soils is with the heat & water inputs microbes break down biomass quickly, compost last in the soils a very short time, so SOC and humus, humic substances, won't build up recalcitrant soil-C.
The Kayopo Indians however found a way around this with their Terra Preta soil protocols.