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what do you mean exactly when you say think economically, not individually? because we already know the entire world creating solar panels/batteries, as you seem to be implying is the way forward, doesn't scale:

- we know that that effort would result in an uptick in carbon production (need to produce all this new stuff: factories, ship it everywhere, etc.)

- we also know that as energy gets cheaper, people use more of it

- there aren't enough rare earths to replace all transportation with EVs, and even if there were it's like 20% of emissions; this ignores rare earths needed for outside storage batteries/grid tech/...

the only solution - happens to be economic - is massive shedding of consumption by basically the entire population of the earth, and if you think your standard of living won't decrease many-fold you aren't being realistic.

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