Why is there “no reason?” This has happened repeatedly throughout history. Climate has always changed. The only difference now is that “preventing” climate change is a huge industry.
Of course climate has changed in the past, but over geological time scales. We're witnessing change in real time, over a period of decades. It's the rate of change in climate that is accelerating.
"Maybe it'll just -waves hands- magically happen" is "no reason". Saying "climate has changed in the past and therefore there is reason to believe that it will change in this particular way, in the future" does not logically follow.
Climate has changed repeatedly throughout history. Every time a temperature increase has changed to a temperature decrease, this must be preceded by the rate of temperature increase decreasing.
We observe the rate of temperature increase, continuing to increase.
Thus there is reason to believe that it will get hotter for some time, before it again gets colder.
Seriously the people who say "there is money to be made by lying about climate change" and then pointing to the few millions of dollars available in public research into climate and NOT the trillions of dollars from multiple countries in selling energy in the form of carbon bonds are just goofy.
These are the kind of people that had to cheat off you to pass biology yet insist that "the immune system works like this"
