Do know that electricity is produced primarily via the burning of coal. About half of the electricity in the U.S. is produced using this. Also, coal is more pollutant than methanol when combusted because it is so impure.

Though, just about everything we do is pollutant in some way, even some stuff the masses are lead to believe is "emission free." For example, hydrogen-powered car's aren't much better than gasoline-powered cars because in order to get Hydrogen, methane must be combusted (along with other processes that require more energy and produce more popution). Hydrogen can also be acquired through hydrolysis, but that requires lots of electricity which is yet again created by the burning of coal. The same applies to electric cars since they are also powered by the burning of coal.

Basically, no form of energy can be had without somehow "damaging" our planet, even things powered by water, wind, or the sun. "Manufacture of [solar] cells requires potentially toxic metals such as lead, mercury and cadmium and produces carbon dioxide, which contributes to global warming." Wind-power and water-power are probably the cleanest, but even dams destroy ecosystems and the materials that dams and wind-mills are made of either come from oil itself (some plastics), are made synthetically using either already-produced electricity or heat from combustion (other plastics), or are mined and processed using machines that require lots of energy.

Not to try to get anyone down or anything, but essentially everything do or create has some negative affect on the environment, so I wouldn't worry about it. If you do want to worry, worry about us, not the Earth. All we are doing is hurting ourselves, since the planet is going to eventually shake us off like a bad case of fleas.