posted 3 years ago
The pollution generated by cars and industry is a negative externality. The people driving the cars pay for the gas, but not for the effect that the pollution has on others: human health, damage to wildlife. Nor on the increase in carbon or eventual heat. Nor on the pollution increasing effects of urban sprawl.
Biochar is a positive externality. It sequesters carbon for all of us on the planet. The person making and burying the biochar creates a positive effect for everyone, but is not paid for it. He/she is decreasing the climate change effect for everyone else. The idea of the credit is to give positive credit for the positive effect that the biochar person gives to society, but is not paid for.
There are other transactions without externalities. If you buy a carrot, and eat it, you get all of the nutrition and flavor from the carrot. You don't damage anyone else with the eating of the carrot, and you don't really help anyone else either. No externalities on that transaction. Economics 101.
JOhn S
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