Science is an imprecise art of choosing a winner from competing theories and weighing them based on how well the predictions are useful. If a theory fails to predict the future, it's basically useless.
The problem with climate science is that it has in the past, many times, made predictions about the future regarding global warming trends and rates based on greenhouse gas concentrations, and they've been totally wrong. Despite the greenhouse gas predictions being accurate, the warming numbers have never agreed with models. Therefore we have yet to find a theoretical model that accurately predict the future. Our latest and greatest model is claimed to be wonderful, but until it is proven accurate, it's just a theory competing for attention and validation.
The further problem with climate science is that those weak theories are siezed upon to justify very very expensive policy choices, that are only worth it if the models are accurate. In the mean time, we will have some people who believe the scary predictions and choose to pay ridiculous proces to attempt to solve the supposed problem, and other people who don't believe the scary predictions and continue to consume the cheapest energy they can, spoiling any effort of the first group to accomplish change.
It's a crappy situation, but it won't improve until some climate scientist can create and popularize a theory that accurately predicts future events well enough to be useful as a policy guide, and prove it with years of successful model validation. Today we have mostly climate scientists who update the model every year to postpone the point in their theories where verifiable results are demonstrable.
Looking back 20 years, the sorts of predictions from that time that agree with the last 20 years of history are the theories that show carbon dioxide has only a minor impact on overall climate. No climate model that predicted catastrophic warming has ever been shown to be accurate when put up against the cold hard observational data. I am a scientist, and I do not believe global warming is a catastrophe, a tipping point, or a crisis in need of policy solutions. But I'm open to evidence as it comes in.