MythBusters build transparent boxes, filled some with carbon dioxide (CO2) and methane (CH4), then monitored temperature differences.
Mythbusters tests global warming theory – does CO2 warm air?
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Most of the global warming experienced in recent decades has been due to ocean warming, oceans that cover 71% of the Earth’s surface. To really test if extra CO2 from anthropogenic emissions, 3% of the total carbon exchange, at 410ppm (0.04% of air), has an effect on global temperatures then the test would have to heat water not air. How many heaters would it take to heat a cold bath?
About 90% of the extra warming generated from added heat trapping gases to the atmosphere, went into the Oceans. Read more on this topic https://skepticalscience.com/Ocean-Warming-has-been-Greatly-Underestimated.html
They increased the gases by 1% and got a result. Of 1C increase, but humans have only increased CO2 by 0.01 % to 0.018.
1 100th of the ratio MB used.
So the rate of temp increase is 0.01% of a degree C