I grow more and more convinced that we’re going to need to geoengineer our way out of this on a massive, massive scale. Even if we went zero emissions tomorrow, the cascade of secondary and further effects from what we’ve already done is going to need to be undone. Project Vesta still seems by far the most promising to me: low tech, moderately low energy, and actually addresses the root cause, unlike approaches that aim to cool the planet by shading or tweaking albedo. Check them out if you haven’t already.
> rock phosphate is a finite resource and the biggest supplies are mined in politically unstable places
A similarity with oil? I think it's a forgone conclusion that politically unstable places are ripe for becoming stable under whatever guise a mining nation chooses. The profits must flow.
Conversion of forest for animal feed as well as plants for human consumption is getting to be unsustainable.
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