Consternation without comprehension

I'm confused about something that I don't understand. At least I'm aware of it; you have to be aware of something before you can understand it, although you might very well be confused about something before becoming aware of what it it.

When I was much younger, in Junior High School, the science class was great. One day we learned that the earth's climate changes over time. Like in this screenshot 

from PBS (taken November 2, 2019), we were taught (did I mention it was in a Science class?) that the earth goes through cycles from warmer to cooler temperatures and back again. Round and round.

In fact, we were told, the earth is currently moving towards its next Ice Age! Furthermore, there was nothing, nothing at all, that we humans could do about it. Colder temperatures were coming in the future, no matter what we wanted or tried to do about it.

After getting a bit alarmed, we were soothed with the information that it wouldn't be for hundreds of years at the soonest.

Nevertheless, this little bit of scientific instruction has stuck with me.

Fifty-five (or so) years later: surprise! Humans can and are doing something about it! We are making the world warmer, through our efforts, and staving off the next Ice Age. Yay!!! Let's celebrate^*, right?

No. Apparently, today's science has a different message^** for us.

I completely do not comprehend, much to my consternation.

Notes

^* I think we should get that classroom of students together for a reunion and build a great big bonfire, to liberate some carbon into the atmosphere, and do our small part to keep the world from getting colder -- doing our small part, since, we can after all do something about it!

^** That message is, roughly, "human-caused global warming is an imminent existential threat to humanity, and we must all hunker down, reduce our standard of living, and give up our freedom to the smarter people telling us this, or risk losing our planet!" [to be read with an increasingly shrill and loud voice]

"reduce our standard of living" happens when we are expected to use less energy for cooling our homes in the summer and heating them in the winter, or curtailing our recreational travel, and so on