The EPA has claimed ultimate authority over the regulation of CO2 emissions, and people add to the CO2 by exhaling. So, if the EPA sees a tweet about someone facing a serious medical condition, for ex., they can inform the HHS to, um, "give end of life counseling" [that exact wording is the law!] to that patient, and then procede to reduce/remove coverage of benefits, hastening the death of said human being. And, tada, the EPA has accomplished it's mission of reducing humanity's "carbon footprint" -- kinda like to Nazi's sending Jews etc. to "special camps" as a "health measure"