CO2-mini
https://www.npmjs.com/package/co2-monitor
https://github.com/maddindeiss/co2-monitor#readme
https://github.com/nodejs/node-gyp/blob/master/macOS_Catalina.md#i-did-all-that-and-the-acid-test-still-does-not-pass--
https://developer.apple.com/download/more/