@Sandra CFCs and Y2K could be effectively addressed by experts working in their fields, backed by government policy. The general public didn't need to do anything, or know or understand anything.
The climate crisis requires an informed & engaged public, which is a heavy lift. How do you motivate them? Fear might get people involved (worked for me), but it won't keep the movement going in the long run; and we'll be dealing with climate change for the rest of our lives. How do you give them hope?