When I was a kid I kept hearing in the media that in 20 years oceans levels will rise by 7meters which would mean the big cities near me would be under water.
20 years have passed and water level is the same.
The problem is there is two issues: 1. Is climate change real - this can be easily verified with observation, and there is solid science proving this. 2. What will happen in the future - here we have tons of research that would not fly in other domains as it is not verifiable experimentally until it actually happens. This are just hypothesis about extremely complex system we do not fully understand. And it should be viewed us such.