Earlier quoted context omitted.
To be fair space flight has some significant advantages from an environmental perspective. Earth observation satellites are essential for understanding how the atmosphere works and how the planet is changing. Also, the unique constraints of space have lead to the development of sustainable technology such as solar panels, fuel cells, and better water purification.
Who cares? Let's feed the poor first and worry about bigger stuff later. Reminds me of a story about a letter written by Sister Mary Jucunda from Zambia to Dr. Ernst Stuhlinger, then-associate director of science at NASA's Marshall Space Flight Center. ( http://www.meaus.com/whyExplore.html )
Better to make incremental progress on poverty, without constraining the innovators to work on problems that don't interest them, or that seem even more intractable than e.g. space travel or AI.