We are burning over 20 MILLION barrels of oil into the atmosphere per day in America alone*. Climate change is real. But you are right, people don't really care.
But like most things in life, it is due to a huge mix of factors, not just one thing:
1) It doesn't impact us right this second so we can literally ignore it. I am still running my normal running routes and so are you. The temps are hotter than last year, but I am still running.
2) People are skeptical of experts in a nation where we are proud to be "free thinkers" (even if we have minimal knowledge of an issue)
3) Scientists have been wrong before so people don't want to "fall for it" again and again. Though if we are fair, scientists are pretty awesome and all out technology works because they are usually right
4) truly changing our lifestyle would destroy the American culture of single-family homes, big cars and trucks, lots of travel, and lots of consumption
5) Despite the fact that it is real, a lot of people assume our attempts to "solve" the problem will never work, so why bother
6) Other culture-war issues like DEI, race relations, immigration, abortion, feminism, gay rights, trans rights, wokeness, M@GA, "gays for Hamas," gun rights, "the war on Christmas," and so on are more likely to inflame voters, so politicians tend to hype up those issues instead
7) Other countries are also part of the problem and we have no hope of getting those countries to make substantive changes to their economies
8) Pretending it is fake triggers the "Libs" so some people just do it to make their political rivals suffer (even if it hurts all of us in the end)
9) The kinds of changes you can make at home are pretty minimal, so many people have given up
10) Scientists named it "global warming" and then realized that all this additional heat in the system would also cause evaporation and thus put moisture into the air. That, in turn, would lead to massive snow storms at higher latitudes, hurricanes, rain storms, etc. Due to all this energy in the atmosphere, it sometimes snows huge amounts. How can it be "warming" if I have snow at my house? This means that they had to change the name to "climate change" which just isn't scary
11) People just don't think 2° Celsius is a lot and they don't care because on a day-to-day scale, it isn't. Even though it is a big deal when applied to the whole surface of the Earth
12) Scientists have solved a lot of our problems before, so we expect scientists to do so again on this issue as well
13) The people who are most brutally impacted by this are not the same people who can solve this. That is a bad way to get a issue onto the front burner...
14) The poor who will have to leave their homes along the equator will probably not be able to make it to America, so most Americans don't care. The global poor will have to move, but not here
15) Global population is starting to drop, so perhaps this will solve the problem in a natural way. Fewer people means fewer emissions.
And this list could go on and on. I am just cranking out "reasons" off the top of my head. There are probably many I forgot.