The reason: oil prices are so low that it doesn’t make sense to develop it further (for now).
When will we see a Tesla of the skies?
World Economic Forum

strange that governments mandate MPG limits on cars and also efficiency limits on light bulbs but can’t mandate emission free taxi on airports by 20xx! Guess someone is spending a lot of money on lobby of politicians.

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.