The biochar part is a detail, all the other pieces need to be in place to optimize the benefit.
Carbon capture comes from planting more trees and not just leaving them there, but cutting them down when their growth rate slows and planting new ones.
Creating the bio char is a byproduct of using the plant mass to heat water for the district heating system, which is an extremely efficient method of heating homes and businesses.
Biochar as a byproduct, in contrast to landfill or burning in an oxygen rich environment comes from a method where carbon release is minimized. In landfills, it's methane. In fire, it's carbon dioxide.
You can advocate for local solutions! The magic here is that they found a mix that works well for local conditions. Your city or town may already be looking at things like this. If they publish a master plan or other planning documents they may include things on energy, waste, climate change, etc. They usually aren't too detailed, but can point you to other things to look at.