Nasa's yearly budget is less than $20bn. Compare this with the ~$600bn on the military, the ~$1.2tn on social secure, the ~$1tn on Medicare, etc. Space exploration is a drop in the ocean. Yet people troll that it's some huge, wasteful money sink, even when the US government is spending $1.5tn on the T35 fighter jet alone.
Moreover, Nasa's scientific work does help with tackling climate change and pollution. They are the ones launching satellites to monitor the Earth's biosphere, and doing work like National Climate Review[1], even as the current administration is removing all reference to climate change from the output of other Federal Agencies.
[1] https://arstechnica.com/science/2017/11/us-government-climat...
Maybe earth becomes a better place, when the people who think so, have all left for new unearthly frontiers! The sooner the better. I am all in for the new space program!