Do I realize that I'm cutting years off my life when I eat sweets, drink too much or don't exercise enough? Yes. I understand the science.
Do I realize that I'm completely wasteful when I throw out food, or generate more trash than necessary. Yes, again I understand the science & the impact.
I do a lot of things that contradict what science says I ought do.
... the point of it all is that excess carbon dioxide in the atmosphere's composition causes a shift in climate, and thus we need to stop putting so much in the air. That's it. It doesn't mean that we need to go back to the dark ages or sacrifice our lives. You and I come from a tech-savvy and responsible country, the USA, and we're going to both need to use that American technology and our responsibility to cut a percentage of what we already produce. Nothing more or less.