Are they sure it is the earth warming it and not just the continuation of the lapse rate[1]? How much warmer is it at the bottom? If it is 5-10 C warmer that co

Are they sure it is the earth warming it and not just the continuation of the lapse rate[1]? How much warmer is it at the bottom? If it is 5-10 C warmer that could just be the atmosphere getting thicker. [1] https://en.wikipedia.org/wiki/Lapse_rate https://en.wikipedia.org/wiki/Lapse_rate