CO2 is not volatile. As always, I'd listen to the scientists on such matters.
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But if there's a break in the pipe it'll silently flow downhill, filling low lying areas, possibly killing many people without any immediately obvious indication of what's causing people to gasp and fall dead.
I'm not in Illinois so I don't have a stake in it, but if that is the primary concern besides side effects of actual construction, maybe having the company install CO2 concentration detectors and alarms? Seems pretty dumb if they aren't already, they aren't that expensive.
While this statement is true, it's missing a lot of other concerns related to the pipeline project surrounding green washing, harm to communities, underdeveloped federal regulation, harm to ecology, and farmland.
CO2 pipelines are relatively new and more pointedly, now being bolstered by tax credits for the private companies seeking to build them at the expense of the communities they run through.
I would suggest reading the linked site in the post, they do a better job of highlighting the issues than I could.
This CO2 Pipeline burst in 2020 and the community is still feeling the effects https://www.npr.org/2023/05/21/1172679786/carbon-capture-carbon-dioxide-pipeline
And guess who benefits the most from building these pipelines? Investors and Shareholders. I think it's worth closer consideration.