Bitcoin can be net positive for the environment. Banks are much worse, for a lot of reasons.
Here is my reply from a similar topic, the question was if bitcoin uses too much energy.
No matter how much energy is used for Bitcoin miners, the electricity bill will still be paid by the miners to the state, and there is nothing wrong with this. this news is really exaggerated by some people, because if compared to factories, Bitcoin mining is not comparable, factories use more energy but people never realize that, I think some people want to make Bitcoin look bad.
You are dead wrong. It does matter a lot. Doesnt matter, who pays it - in production cost is too high, its pointless to produce it (once pump&dump is over) and it will be abandoned.
If the price decreases, it won't become pointless to mine. All miners have a different cost base. Miners whose cost of electricity is very high will stop mining. The difficulty of finding blocks will adjust (decrease) and life will go on. Variations in price will definitely not decide the future of Bitcoin as a currency and as a network.
You dont get it, because You think in short term. Halvening lessens reason to do mining exponentially. After 2 halvenings from now on, mining would become pointless EVERYWHERE in world. They also cant hide the cost of mining into transaction fees any further, which are already about 5 times higher, than average stock exchange rates.
By the way: if BTC really became a money, it would happen even faster. But dont worry, it wont... so You from technical point of view You have few years of pump and dumping left. I doubt it goes for economical point of view too tho.
Well, none of you are quite right.
While it matters how much electricity is used, bitcoin is a net positive for our electrical grid, using energy that would largely be wasted.
If the electricity is produced by conventional and dirty means (coal and gas fired plants, nuclear) then we're always overproducing (because we can't just open up a half factory, and we always have to overbuild for population and energy usage growth)
The electricity will most likely be generated anyway, so we might as well use it.
If a lot of people start using a lot of electricity, prices are going to go up, bitcoin mining farms are not essential so they will shut off and people around the world, with cheap electricity are going to ramp up their hashrate.
If the electricity is green, bitcoin is actually subsidizing green energy (an argument Andreas Antonopoulos has made). The infrastructure to either store or transport the electricity away is usually beyond the budget of alternative energy.
The solar panel is going to produce anyway, whether you can store it or transfer it away or not. And if you can't store it or sell it, bitcoin gives you another option to make money with it.
This also applies to homeowners who aren't allowed to sell their electricity.
Therefore bitcoin subsidizes green electricity.
As Andreas Antonopoulos put it "So you're telling me we've been running a green-coin all along?"
Finally there are plenty of reasons to mine after the mining reward from new coins falls to practically 0, the mining fees and also just to keep the network secure.
We are all stakeholders after all.The less mining pools, the more you get out of those transaction fees. If bitcoin becomes huge, the reward may be even bigger than it now is (in terms of real world value rather than bitcoin (purchase power)).