"A City on Mars" by Kelly Weinersmith and Zach Weinersmith

This book is a refreshing critique of insane plans to settle Mars. The authors outline the pros and cons of the settlement from multiple perspectives: psychology, sociology, politics, law, physics, and more.

Overall, I feel like "A City on Mars" turned my perspective 180 degrees, and now I want humanity to make Earth work, as, frankly, settling Mars is very infeasible.