The Sixth Extinction by Elizabeth Kolbert
Well written, informed. She's a journalist, so knows how to keep her reader interested in at-times rather detailed scientific material. Changes up nicely to keep things lively. Full of interesting personal/professional but not cloying stories. Not proselytizing, you are left to draw your own conclusions, your own feelings. I'm ~1/2 way through.
Water 4.0 by David Sedlak
He's a professor, and I believe it's his first book for popular consumption. Not as entertaining as the other book. However, this book is providing me with information I have never encountered about things that are fundamental to human civilization: usable water and the problems concerning waste. It's both historical and scientific. I'm around 25% into it. He starts with the Romans and takes it from there to the present time and extrapolates, explaining where things can go from here.