Geo-engineering is scary because of the law of unintended consequences*. And because of its reliance on high-tech.

Here’s a relatively low-tech idea. Grow a lot of harvestable wood. Then make charcoal. Bury the charcoal in the ground. Repeat.

The process produces some useable energy. It also produces some CO2. But the CO2 does not come from fossil fuels — it is part of the non-geological carbon cycle.

Buried charcoal stays in the ground much longer than buried organic matter. (Organic matter in the soil I(“Soil Carbon”) is mostly and quickly broken down by microbes and returned to the atmosphere as CO2.)

*Global warming itself is an unintended consequence of a technological breakthrough.