Almost everytime I look into an alarmist’s claim, there is an easy to identify natural cause of the observation.
The arctic sea ice is greatly impacted by the wind direction, storms and warm water entering the arctic. None of which are due to CO2.
Polar bears are doing just great, so there is no issue there.
The Mt Kilimanjaro Glacier is disappearing due to sublimation, not warming.
Now we have an explanation for Great Barrier Reef bleaching. El Ninos and El Ninas alter the sea level of the reefs, and the lower the sea level exposing the coral. Coral is shallow water tend to bleach. Not due to CO2, but due to exposure. Put almost anything out in direct sunlight and it will turn white. No CO2 needed.