Interestingly enough, 2024 marks 200 years since Carnot first formulated the second law of thermodynamics in your chosen home country of France.
But I don't understand why you expect Neanderthals to be up with scientific concepts proven a couple of centuries ago?
You're basically arguing with monkeys that tap away at modern technology someone else built for them and that they don't have a chance of understanding.
Even if they were right about trees vs solar panels, this discussion proves that they *still* don't understand that local heating on the ground isn't the problem - the problem is that due to atmospheric changes heat is leaving the Earth slower than the heat from the sun comes in.