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Just adding on to this, some math:

The US emits about 11 gigatonnes of CO2 per year. At $150/ton, sequestering it all would cost 1.65 trillion dollars or about 8.25% of GDP.

That's about what we spend on social security and the military combined.

So, it's a lot. But it's possible to imagine doing it.

I kinda wish there was a company with a bunch of sequestration equipment out somewhere that people could just give money to in order to suck out more CO2 from the air. Why doesn't this exist yet?

Er, I screwed that up.

China emits 11 gigatonnes. The US emits ~half that. So more like 800 billion or 4% of GDP. About what we spend on Medicare.

Of course, even if US emissions went to zero, it wouldn't be enough to stop global warming. So there's that.

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