Christophe wrote:Well, hence the idea of only burning a small piece of carbon ... and comparing temperatures under the same radiation (full sun) ...
Ah OK, I thought you wanted to see if the CO2 is causing warming et also the effect on an ecosystem, all in the long term.
But actually if it's just to check the effect of CO2 on temperature, over 1 day, and without an ecosystem, it's simpler.
A dose of CO2 at saturation to start and to see, a thermometer and it is won.
If it gives something significant, then you can tweak it by adjusting the 400ppm: by putting a defined volume of CO2 from a bottle as above, replacing a specific volume of water, for example.
suddenly no need for regulation or sensor.