I think we're at that point already. The difference this time is that the creationists and flat-earthers, whilst not exactly harmless, can be reviled and ridiculed at our leisure. Obstructionist behaviour by climate change deniers with vested interests is urgently dangerous. We can't afford the luxury of sitting around forever arguing with these nutcases and their ignorant camp-followers (of whom we have at least two in this thread). Atmospheric carbon dioxide is now at 0.04% for the first time in human history and is still rising, revealing that whatever steps we have so far taken are woefully inadequate.

With respect, Stanron, I think it would be a good idea if you acquainted yourself with the carbon cycle.