The research has been done by the weed growing community. I don't know any professional growers using sensors outside of the American Scientific as the cheap ones are inaccurate and failure prone.
If you think GMail is pain free you'd be even more pleased with Fastmail. I simply cannot self host my mail/contacts/calendar because nothing that exists -- free or not -- can compete with the usability and available power user features of Fastmail.
You are not going to get an accurate CO2 sensor for $27. You're being misled into buying cheap Chinese crap.
An accurate CO2 sensor is much more expensive. I would not trust the readings of the sensor in this blog. It's going to be off by over 100ppm, especially if there's a lack of good airflow.
If you can read your WhatsApp messages on your phone and you don't control the WhatsApp binary... then Facebook can backdoor WhatsApp to read the decrypted message.
And this large amount of oil production the USA is sitting on is light sweet crude, needed for gasoline? Same grade as Abqaid? And we have the infrastructure required to transport it?
(Hint: we don't. It's estimated it would take us minimum of 2 years to complete the required infrastructure build out)