>For example, you could perfect growing algae and let the algae extract energy from sunlight on its own Yes, we only need to produce more fertilizer than we ev

>For example, you could perfect growing algae and let the algae extract energy from sunlight on its own Yes, we only need to produce more fertilizer than we ever have and keep doing that year on year forever. >as silicate is weathering it will naturally extract CO2 and the question is how efficiently you can powder rock. We only need to mine an Everest worth of stone each year for a millennium or so. Yes. Such achievable goals. The only ones that come close to being reasonable is dispersing aerosols in the upper atmosphere and reducing the sunlight that reaches the ground directly. That has the problem that we need sunlight for such pesky things like photosynthesis.