[Scaevolus]

It's easy to ignore where your power's coming from when your vehicle's not burning fuel-- in the US, ~40% from coal and ~30% natural gas.

Morality fades away when the results occur at a distance. Compare plugging into a socket to pumping gas, or buying cuts of meat to slaughtering an animal.

[sp332]

Centralizing power production, even in a coal-burning plant, is better for the environment than burning fuel locally (and extremely inefficiently) in a helicopter.

[timmaah]

So just ignore the "emission- free" quote on their home page.

[sp332]

The helicopter is emission-free. How you power it is up to you. You have the option of using an emission-free source, which is not an option with normal helicopters.