Don’t we run into problems of low level carbon dioxide poisoning, if we hit the levels of “the only way to keep the planet habitably temperate is to reflect sun

Don’t we run into problems of low level carbon dioxide poisoning, if we hit the levels of “the only way to keep the planet habitably temperate is to reflect sunlight”? At around 1,000 ppm we’d hit the point where everywhere outside you’d be noticeably affected. Which is around where we’re projected to be by 2100.