I don't think so, bitcoin mining contributes a relatively small amount to environmental pollution. There are larger industries in many parts of the world who are affecting the environment in the negative sense through pollution. I believe the future of bitcoin mining is even brighter as many projects plan on producing a cleaner source of energy.
Absolutely correct, only a percentage of the electricity consumption of the entire world is consumed by miners. Considerering that other countries' electricity is produced through nuclear power plants.