"Well, who you gonna believe, me or your own eyes?"
--Chico Marx, Duck Soup
There are several kinds of opponents of a meaningful response to the threat of climate change. But the prize for intellectual dishonesty goes to those who, with unwitting hilarity, suggest we ignore evidence in front of our faces in favor of their insistent fiction.
There's plenty of evidence that comes straight from the Earth:
One can argue for hours whether this year was warmer or colder than last... [but] it doesn't matter. We should be reading the earth, not thermometers. The earth is clearly warming, and sea level is clearly rising.The physical evidence can be measured, and generally has been measured over decades or centuries. Look at sea level rise, antarctic ice sheet collapse, retreat of glaciers, permafrost melting, ocean acidification, or any number of other indicators that don't require settling an interminable shouting match over temperature trends.
Skeptics confuse weather with climate, blather about putative "global cooling", mount endless ad hominem attacks against scientists, pretend to be authoritative, distort economic effects, strew red herrings, and cling tenaciously to comfortable fantasies. To believe such charlatans is to choose delusion.
If it walks like a duck and quacks like a duck...