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It isn't that complicated. It's possible to track changes to global warming. The problem is to forecast what those changes excactly will do with the earth.
When we notice that the density of salt in the northern atlantic decreases, it's easy to spot it to be due to melting of poles. Scientist also know that the salt density is what makes the warm water drop and go back south. Decreased salt density in the north ocean will slow down the circulation. It's already slowing down. What is complicated, is what the consquences of this will be.
This denial of global warming reminds me the problems Galileo and Darwin faced in their lifetime. People simply didn't understand how science could figure out those things and did not belive them. Nowdays 97 percent of climate researchers agree with each other, but still many people thinks global warming is controversial and yet to be proved.
actually it is that complicated. That's why there is no consensus agreement on cause of global warming within a scientific community