I think what Elon Musk and Tesla are doing to accelerate the growth of sustainable energy is admirable. I think they have accomplished more to reduce our carbon footprint in the past 12 years than any other company. SolarCity is another example of advancing technology for sustainability. All of this said, I can't help but cringe every time SpaceX launches another rocket. The amount of pollution introduced and fuel burned may offset all that Tesla and SolarCity are doing? I've always thought that space exploration, while cool, is extraordinarily wasteful and damaging to our environment. Perhaps I'm too short-sighted, but I just don't see that these technologies work in concert with each other. For all of Elon's preaching about sustainability, how much damage are we doing with each SpaceX rocket launch?