Silent Spring by Rachel Carson, $2.99 at Amazon
https://www.amazon.com/gp/product/B004H1UELS/
The Sea Around Us by Rachel Carson, $1.99 at Amazon
https://www.amazon.com/Sea-Around-Us...dp/B004TC14F0/
(Both of these were written over 50 years ago, so some of the science is out of date.)