In the past 8 months our previous work:-
1).we did an experiment with tree seed bombs that we supplied to schools a total of over 3000 seed balls the challenge we faced we could not measure the impact and ascertain actually how many germinated from the exercise the fact that we had intermittent floods in the country. reason scaling down on tree seed bombing in Q3. in Q2 we also did river cleaups collecting over 100kgs of non biodegradable waste materials again in Q3 flash floods and over 2 months of political protests in our region possed a challenge for this exercise.

2). In Q3 we did a research on biochar and vermicomposting and as IPCC report notes Biochar is the safest, most durable and fastest way to draw down carbon today. ( https://www.reversecarbon.com/blog/ipcc-biochar-potential-to-remove-26-billion-tonnes-co2)
To date we have composted over tonne of organic waste and produced over 200 kgs of fine biochar. Composting takes a duration of 3 months and we were able to fetch over 150kgs of sieved fine compost that we mixed with biochar to produce over 350kgs of organic fertilizer ready for free distribution to farmers.
3). In Q3 we have partnered with ( www.kefri.org)  where we have an ambitious tree nursery project to produce over 30,000 Grivellea Robusta and Cordia Abyssinica tree seedlings on Greenpill regen farm hub. we also acquired 1500  tree seedlings ready for planting with Organic biochar fertilizer awaiting approval to access Ngong forest for the exercise.
Free supply of biochar organic fertilizer and workshops to farmers on how to produce is a no brainer on how much carbon we can sequester.
Scalability and Quantifying carbon sequestration potential.
Biochar production and composting is low- tech process that can be implemented on a small scale or large scale making it viable for global carbon sequestration needs.
Estimates suggest that biochar carbon removal potential ranges from 0.3 to 4.9 billion tonnes of CO2 per year (GtCO2 yr−1). 
Grivellea and Cordia trees have a net 48% of carbon sequestration
https://www.researchgate.net/publication/329905670_Assessing_the_contribution_of_Grevillea_robusta_trees_to_farm-scale_carbon_fluxes_in_the_Central_Highlands_of_Kenya

Main challenges are Life cycle assessment to evaluate the full carbon footprint of production and application hopefully research will get us ther

