I, actually don't have the solution to the usage of fuels, because the reduction of one increases the consumption of the other. Every power plant is made of something, I mean some raw material is used. Regarding public transportation, I think the planers are planning quite something else, even though bicycle is just fine too. Here we are starting to have services like you can rent a bike when you travel with bus or train. But elsewhere, in busy cities I think they also plan high-velocity Maglev trains using magnetic levitation and sort of capsules lifted on poles that you can call by a mobile phone, like Skyway elevated transportation intercity system based on string technologies of dr. Yunitsky. Not much of returning to nature.