I don't think Bill Gates has much of a clue about what the world needs, he's very hypocritical. He lives a very consumptive 1% lifestyle (nothing wrong with that in my eyes - he earned it) but yet he turns around and preaches that everyone needs to change. Start with the man in the mirror bub.

Elon Musk is a bit better than him since he doesn't preach - but I would agree with Gates that he's a little gung ho on space travel. I honestly don't think it is humanity's place to leave earth, we are fish in water. Whatever comes after us (speaking in terms of evolution) will be the alpha in terms of space travel.