Spaceflight

I've always argued against this and always make light of it by pointing out that we're doing a terrible job of maintaining the living environment, ecology and atmosphere of the planet we are inhabiting here now.

If we are going to take billions of dollars worth of effort to try to colonize space, we should first apply our knowledge, expertise, time, energy and money maintaining the only livable habitat we know of in our tiny corner of the galaxy. I say that because we are degrading the one we have. We argue that we have to figure out how to leave the planet because we are degrading our own environment. A more logical solution to the problem would be change to our behaviour and make our home planet much more sustainable and livable for all its inhabitants. If we don't, then we will just be transplanting our problems here to any new colony we start somewhere else at great expense.

Once we figure out how to make our living environment manageable, stable and balanced, then maybe we can start venturing out safely into the cosmos.