Or do you think that electricity consumption is not bad in itself, just the way it is made. eg. If all of bitcoin was powered by solar, it would be fine.
The problem with solar is it works with batteries. And creation of batteries is much more harmful to the environment. Every way we have known so far have adverse effects to environment, with some exceptions such as wind power and hydroelectric power, which is good but also affects environment (such as dams for hydroelectric that bring imbalance to the ecosystem). What I think we should focus at is how to recycle the materials used to lessen environment effects.