There are all of these people who are still in denial about the problem, and how bad it will get. There are others who point to the early forecasts for when things will get bad. So, here's the answer for you, and MAYBE you will be able to understand.
First, for those who point to predictions made in the 1970s-1990s as being wrong, because effort has been made on the issue, that slowed things down in terms of how quickly temperatures would rise. It didn't STOP it, but it did slow it down a bit. We also have more information today than we did back then due to the Internet and having more weather stations brought online to collect information from more locations, so all of the weather models are improving over time. The science is still a work in progress, since meteorology isn't something that could really be studied well before the later part of the 20th century.
Now, for the first part, not realizing how bad things will get, the situation ACCELERATES over time, it's not a steady thing, it gets worse at a faster rate as time goes on, until things change. Trying to slow down the acceleration is what is now needed, but the push for AI data centers and using as much power as possible for the personal profit of a relative few is counteracting the efforts to slow down the destruction that really is happening. Look at how severe storms are, not just the number of storms, but how bad they get. Lack of rainfall harming farmland, excessive rainfall in other places, severe weather systems, an improvement that would at least get back to a stable condition where things aren't getting worse should be the new target, but again, just ignoring the situation is like looking at teenagers doing really stupid things that might get them killed or where they may kill others and not even trying to do something to avoid senseless deaths. We should ALWAYS try to make things better, even if there isn't much we can do.