Bill Nye the Science Guy has other ideas.
"The Earth is our home; there's no other place to go," Nye told Mic in a phone interview. "And this idea of going to live on Mars, it's not practical. This is it, man."
So why no plan B colony on another world?
"Do you call the McMurdow Station in Antarctica a colony?" Nye asked. "No. Mars is far, far more inhospitable than Antarctica. Far harder to get to. Far fewer resources. So having a scientific station there, that's cool. We're all into that. But having a colony where people are born and have their own Olympic Games and stuff, that's really so much more difficult than you might think."
But Nye does thinks space exploration itself is a critical part of Earth Day.
"Space exploration, learning about our place in space, learning about the nature of the cosmos and how we fit within it, is part of the message of Earth Day," Nye said. "Earth is our home, Earth is our spaceship. This is it. This is where we build our colony. We gotta take care of it because we're part of the ecosystem."
Understanding our place in the universe is why we send missions to places like Pluto, Mars and maybe one day Europa or another star system, Nye said. And that's why we need to keep on exploring.
Investigating new worlds can also bring us together. "Space exploration brings out the best in us," Nye said. "It brings out the best in humankind. It brings raving conservatives and raving progressives together. Congressmen and senators work together on these cool space missions. It's one more thing to love about space."
Maybe we can use the same spirit of cooperation to find an effective way to fight back against climate change. We need a solution more than ever.