and we're back with rusty schweickart former nasa apollo 9 austin not resting. it's a planet or. threat right there so it does require a planetary effort to do yes and that is the biggest challenge it is because when that look at global warming i mean how much more proof do you need that it's here and we needed to take care of it not today and tomorrow but yesterday at this hour still doubtful this is also this is also a very big question but there are good answers to this that the 2 issues planetary defense in the sense of being an ex essential issue and climate change also an existential issue are both big and existential issues. so they have some similarity on the other hand with climate change all of us have to change our behavior to be more responsible for the way we act in terms of our relationship with the earth and this living system when it comes to asteroid defense none of us have to change our behavior all we have to do is spend about a $1000000000.00 or $500000000.00 on the rare occasion when there is a threat to deflect it but you and i don't have to change our behav