I wouldn't say these projects are bias towards silicon valley style there is simply a growing acceptance that nature based solutions - whole undeniably important and essential - are simply not enough.
They are cheap but slow. Trees can be wiped out with wild-fires releasing CO2 back into the atmosphere.
Negative emissions technologies such as bio-oil, direct air capture and storage, olivine and biochar, are developing to help support nature based solutions and remove quickly.
While expensive at the moment I believe they will become cheaper as the technologies and processes mature and the economies of scale kick in.
I don't say this to convert you - nature is a great way to help combat the climate crisis - however do not dismiss this essential step for our future.