Well, Bill Nye isn’t a scientist and he shouldn’t be considered an authority on scientific matters, but I would agree with him here. There’s really no reason to. Earth realistically has the resources to support humans, if we use them correctly and avoid doing damage to the natural cycle which has allowed life to thrive. Solid state batteries, superconductors, superfluids, and nuclear fusion are what we should be focusing on right now. Besides this, the dangers of the Martian surface are such that the only reasonable way we could colonize it would be underground. If we really want to colonize another planet, Venus is a much better candidate. Given the fact that the surface of Venus is literally the closest thing to Hell you can imagine, that might sound odd. However, we also need to acknowledge that Venus is practically Earth’s twin. Being very similar in size, the force of gravity is about 90% of Earth’s, versus the mere 30% on mars. Venus is also easier to get to. On average, Venus is much closer to Earth, and it reaches its distance of closest approach far more often than Mars does. Where as we may only get a good launch window every 4 years for a 2 year long trip to Mars, we’ll get a good launch window every 2 years for a year long trip to Venus. Also, the lack of a global magnetic field on mars means very harmful radiation from Sun. While Venus doesn’t have its own magnetic field, it’s close enough to Sun that it gets induced a global magnetic field. While the surface is literally hell, the atmosphere is extremely thick. So thick, in fact, that we could legitimately build floating cities above the cloud tops using blimps. Blimps would be far easier and less expensive to transport than large modular living spaces that would be needed on Mars. At this elevation, the temperature is around 60° C, which is hot as hell, but manageable with cooling technology. There is also a great deal of water and other resources we can scoop up from the atmosphere. The only issue is we wouldn’t be able to walk around and plant a flag anywhere.