If we gotta have scientists tell us that, we have serious issues. The time for scientist warnings was like fifty years ago, when people could pretend not to see the future badness. And those warnings were there, ignored by many, especially by people in power.
They published this in Popular Mechanics in 1912, we've been ignoring this for a long time:
The furnaces of the world are now burning about 2,000,000,000 tons of coal a year,” the article reads. “When this is burned, uniting with oxygen, it adds about 7,000,000,000 tons of carbon dioxide to the atmosphere yearly. This tends to make the air a more effective blanket for the earth and to raise its temperature. The effect may be considerable in a few centuries.
https://books.google.ca/books?id=Tt4DAAAAMBAJ&pg=PA341&dq=carbon+climate&hl=en&sa=X&redir_esc=y#v=onepage&q=carbon%20climate&f=false
Also, this Wikipedia article has a good summary on the overall arc of our understanding: https://en.wikipedia.org/wiki/History_of_climate_change_science
This summer? This winter was insane as well! (at least in my area). Two weeks of actually below zero, and virtually no snow outside of those two weeks this entire summer. The average temperature, once you exclude those two weeks, was like +5-10! It felt like we were living a good 20 degrees further south or something this winter.