Of course the Earth's climate has naturally varied over its history.
I think the current climate change is a combination of both natural and man-made causes.

Five mass extinctions occurred well before humans came along, and the sixth is currently well underway. This time though, 7.5 billion people are affected.

The fact that the warming and extinction rate are occurring much faster than it has in the past, makes me believe that the man-made factors are significant.

Now, here's a curveball. The PTB have been conducting a massive global geoengineering program for decades in a futile effort to slow climate warming. Among the methods being used are stratospheric aerosol injection (chemtrails) and chemical ice nucleation. Evidence of these operations show up clearly on satellite photos if you know what to look for. They probably prevented the Arctic ice cap from melting completely off this past summer. For more info, see the Dane Wigington channel: https://www.youtube.com/channel/UC18-7qYJWAqM9eF1GvMn6Og