I do think it is overstated, but I do believe we are contributing to climate change.
You know what else did, back in the day? Volcanoes. Those things aren't so active anymore. But 7 billion people are very active.
humans are contributing to pollution and depleting resources. Humans are not changing the climate of the planet.
The where is the CO2 coming from? You're pretty quick with the proclamations, not so much with coherent answers to important questions.