The problem is that everybody has been hearing Doomsday predictions for so long that they're all just sick of it.
No, the problem is that some people have the attention span of a housefly.
A lot of people also remember that it wasn't that long ago that climate scientists were predicting another ice age. A lot of older folks remember this so it's hard to blame them for taking the global warming scare with a grain of salt.
A lot of "old folks" remember when cigarettes were healthy.
There was never,,,ever a time when more than tiny handful of scientists thought there would be another ice age. You're bullshitting. This bit about how "not long ago scientists were predicting an ice age" is simply a denialist lie. As in not true. As in you made it up because you think it helps your argument but really makes you sound extra stupid.