Lack of evidence isn’t the problem. Just like how a parent must teach a child instead of submitting to a child’s demands because the parent should know better, climate change deniers mustn’t be allowed to have functional decision making power over climate change policy.

Of course they do have it now and will continue to have it until we have a blue ocean event, totally receded glaciers, scorching summer seasons, and slower brains from the ever increasing carbon dioxide molecules ppm that rises and rises and rises and rises. Much like how the seas will.

https://en.m.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_atmosphere this graph is literally foretelling the future