Ocean Science and the measurements taken by institutions such as Scripps and Woods Hole are very accurate when it comes to global sea temps, acidity and level. The concerns expressed in the linked article are factually based...and the effects are happening as we speak...e.g. Crab Fishing has to go further and further north off the West Coast now...never had to deal with that before.
Link: https://wildplanetfoods.com/blogs/blog/climate-change-effect-on-marine-life?srsltid=AfmBOooQvOWvZyFBPqvnEDask68womo3O9iv8htD0Bh2d_KTJ-1z47MZ