Or we could just spend those 400+ billion dollars a year on making life on Earth more sustainable so we buy us plenty of time for space exploration and other lo

Or we could just spend those 400+ billion dollars a year on making life on Earth more sustainable so we buy us plenty of time for space exploration and other long-term pursuits without having to engage of the panicked "get off of earth" escapism that plagues much of the space enthusiasts (like Elon Musk). We either stabilize life on Earth or we won't have enough time to make humanity inter-planetary anyway. Space adventures are just so low-priority right now (meanwhile important science can be done with unmanned vehicles).