Global warming is something that happens very slowly. Oceans need to be kept at a fairly constant temperatures for fish, mammals and plants to survive. A drop or rise in temperatures threatens marine environment, which we all rely on so much.
A few pages the deniers need to read
https://www.google.com/search?q=glob...&bih=626&dpr=1 pages of 100,000s that the disbelievers need to read.
https://www.treehugger.com/natural-s...ead-zones.html
https://www.theguardian.com/environm...entists-charts
Finding a few unreliable pages won't prove you right onwebcam.