Glacier National Park used to have 150 glaciers at the end of the last century. It now has 27. Within the next few years we should be able to use the Arctic sea lanes through most of the year because most of them are darn near ice free already. Permafrost in Alaska is melting at an accelerated rate releasing more methane into the atmosphere.
No, global warming IS happening.

Mt. Pinatubo in the Phillippines....I remember that year because my wife & I took our annual vacation in August of that year & it was downright cool for an August. The next summer rebounded nicely. All due to volcanic ash & dust in the No. hemisphere.

Should we try hard to cut down on greenhouse gas emissions? Well, of course, why not? That's just good stewardship. But that doesn't mean I think we should begin to jump off the cliff with every half-baked idea that pops up.