I don't think it's needed to go to these lengths. I consider travelling invaluable, even with an airplane. The greatest wisdom one can get about the world is through experiencing it. While individually we can all do a lot, the bigger problem is the environmental frameworks countries and cities put into place. While environmentalists often want to see change happen overnight, it won't be the case, because the world and our economies were not set up not to crumble under the weight of seismic changes like that, so it needs to be gradual. Fast but gradual. I am very conscious of the environment myself, but being also a pragmatist, I know that marching down the streets is one of the least effective solutions to our problems.