Global Warming is both real and a scam.
As many know throughout history (mostly prehistory), our planet has undergone periods of warming up and then cooling down, warming up and then cooling down. The period between Ice Ages, where the Earth's temperature rises, the time period we are in now, is called the Holocene. So, whether or not we humans were here, the Earth's temperature would rise.
However, we are indeed speeding up the process. We are simply bring another Ice Age closer, faster, but not by much.
Global warming is still a scam because of the money put into it, as that scientist in your article pointed out. No matter what we do, we cannot stop GW, so why donate money for the effort..?
The only thing we can do is lessen our effect on it, which can be done with clean energy, etc.

So.. yeah. If you want me to go into further detail explaining why the Earth goes through periods of warming up and cooling down I can, it's very interesting.. but you'd get a tl:dr post.