What makes you believe temperature isn't accellerating? CO2 in the atmosphere won't go away on its own for hundreds of years, and trapping more and more heat will have exponential effects leading to chaotic climate instability. CO2 is not declining, even in the pandemic year it is still rising sharply way beyond extreme levels for tens of thousands of years: https://www.co2levels.org/
Please see David Attenborough's "A life on our planet" (Netflix) what exactly may happen and what to do before it's too late: https://www.youtube.com/watch?v=KglanVLBVrc