Whether the earth has the capacity to mitigate itself or not, it doesnt mean the pollutants wont have harmful effects in the shorter term. Lead comes from the earth, and is concentrated in humans through our actions, and when we die it goes back to the earth. That doesnt mean its harmless while it's in you.
Plastic may be made from petroleum, but once its changed form, the earth is not going to change it back to oil
The volcano thing is well known among environmental scientists. But the conclusion that we should just throw up our hands and ignore any human impacts is pretty short-sighted. It just proves the world is a hostile place for human life, and we best avoid making it worse.
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