> there will always be current challenges that we face on earth To me, climate change seems more existential than our other challenges. The reason we can use e

> there will always be current challenges that we face on earth To me, climate change seems more existential than our other challenges. The reason we can use earth as a base for interplanetary exploration is because the environment is favorable to us. We are putting that at risk. The only other problem that feels similarly serious is nuclear way.