I saw the rate at which people consume canned and bottled drinks and every where is littered with the empty bottles. They don't get easily degraded and they block drainages and pipes which can result in flooding
I gathered the bottles, washed them and gave them to a local recycler who melts them and sell it back to the manufacturers as raw material for production of new bottles. In a way, I have solved a challenge.
SpaceApps is a NASA incubator innovation program.