There are many things that currently affects and can affects the climate causing unusual changes and Bitcoin mining is not the major concern. If A brief research is conducted, there are many other major causes like industrial activities, manufacturing activities, the activities of oil and gas companies, urbanization, gasses from fuel and diesel engines etc. All these other factors have not yet been addressed completely, so blaming that climate change is majorly a cause of Bitcoin mining and its activities is just an excuse to criticize and speak bad of bitcoins.