According to the Bitcoin Energy Consumption Index, it takes 1138 kWh of energy to process a single bitcoin transaction at the time of writing, which equates to the energy required to run a single US household for 39 days
Researchers at Cambridge University estimate that bitcoin mining is actively using over 120 million megawatt hours of energy every year.
bitcoin mining and transaction consume lot of electric energy . which is lot of energy
Coal co2 emissions per kwh
The emissions per unit of electricity are estimated to be in the range of 0.91 to 0.95 kg/kWh for CO2, 6.94 to 7.20 g/kWh for SO2, and 4.22 to 4.38 g/kWh
hence bitcoin is not environment friendly transaction hence causes a lot harm to nature there are many alternative coin that will win the race.