Global Warming and Cooling is a natural cycle. Yes. But to think that ~7 billion people cutting down forests for grazing land for cattle, driving cars which just throw pollutants into the atmosphere doesn't have an impact on the cycle, in this case accelerating it, doesn't have an impact?

Believe it or not but the effects are not negligible. Introducing artificially made gasses into the atmosphere has had an impact and created ozone holes. As far as we know, ozone holes arent some negligible things...

[Citation needed]