Please stop trying to hurt every single human being with these derailments. There is no plausible mechanism by which carbondioxide levels would halve. That means you're just trying to derail the discussion by appealing to people's instincts about how fragile atmospheric composition is. Stop.

I can see how you’d think that. We’re all a product of the media we consume.

It’s an interesting exercise to try to figure out what the ideal co2 level should be. Why are we fixated on preindustrial levels. I’m very open to thinking 600ppm might be more ideal than the current level.

I feel that idea has some support from things like the optimal for many crops/greenhouse plants being 800–1,200 ppm. And that Earth's vegetation has greened since the 1980s due to increased CO2.

They aren't at risk of halving, though?