As people pay for the electricity used for mining I don't see any problem, I mean with the enviroment unless there's mega farm using a bad based power plant for electricity supply can be very bad .

I have seen some of the figures being released saying the annual consumption is something like 45 TWh. The most commonly referred calculation is here. They are using the revenue earned by miners to back-calculate the energy consumption which looks pretty flawed. Some back of the hand calculation shows that figure is pretty inflated.

The S9 consumes 1350W for ~14TH/s.

If all the mining hardware is assumed to be as efficient as the S9, We'll have 21,000,000/14 = 1,500,000 S9 working.
Per day consumption: 1,500,00 X 1350W x 24 Hrs = 48600 Megawatt Hr.
Per Year: 48600 X 365 =17,739,000 MWh = 17.739 TWh.

Now, multiply this by a factor of 1.5 to account for cooling costs and the distributed hardware, we have an estimate of around 27 TWh.

Of course, i am pulling this factor of 1.5 just randomly but i suppose its a reasonable assumption. It means for every S9 consuming 1350 Watt, you spend 675 Watt for cooling and auxiliaries.

The calculation up there which shows 45 TWh is an alarmist figure.
The 27 TWh per year is also pretty humungous.

Bitcoin network like any other value proposition system will use energy. The figures being given out sound alarmist to me. What needs to happen is that Bitcoin miners should shift to more energy efficient hardware. Bitcoin community and miners need to find solutions to these problems. It is  a governance issue and it can be solved. People just need to  put their head together and in the meanwhile, we all need to do a bit more math..

I think acquiring solar electricity generating system for bitcoin mining is more complicated and more expensive. Currently mining is not that profitable as before so I don't think miners would consider using solar panel because doing so they would have a longer return of investment period.

Bitcoin has been the biggest wealth distribution since many people have benefited from it. It also boosts the economy of a country and much even to a very progressive country already. Just imagine how many people can participate and can earn in a bounty campaign each tim ico ends.

I think the electricity consumed  for mining bitcoins is negligible to the total supply of electricity in the world for it to have effect on the environment. Heavy industries consumption of electricity has not affected the environment so much that bitcoins generation can even be compared to.

I think that is very influential to the environment because more and more fuel is needed to supply electricity.
I think with the miners bitcoin that uses a lot of electricity is also greatly affect the price of electricity.
the government is monitoring many people now use electricity so the government concludes that the society is now rich that the rich miners are actually causing the increasingly expensive electricity tariff and the impact of the small people also feel.

Does Bitcoin indirectly become a threat to the environment?
bitco
Bitcoin diggers like this consume a lot of power each month, and even higher than many countries in the world.
 
Unlike "real" currencies such as the US dollar or the British pound, "virtual" money is not issued, as is the bank. Instead, they are "dug" from the computer through an algorithmic process, and this process requires enormous amounts of power, maintained 24/7.
CNN wrote an article quoting meteorologist Eric Holthaus as saying, "Bitcoin is slowing our efforts to convert natural fuels into clean energy." Digiconomists also reported that Bitcoins currently consume an average of 32TW of electricity per year (equivalent to 32 billion kilowatts of electricity), and that is enough to supply more than 3 million homes in the United States. .

Every technology is harmful to invironment, whether they produce small, little, or big radiation, they give effect on the invironment,,, but bitcoin atleast help people in their lives, in many ways...