Based on the review, I would rate the textbook 4 out of 5 stars.
In conclusion, "Environmental Studies" by D. Dave and S. S. Katewa is a solid textbook that provides a comprehensive introduction to environmental studies. While it may have some limitations, the book is well-written, easy to understand, and covers a wide range of topics. I recommend it as a valuable resource for students and environmental science enthusiasts.
As for the pdf version, I assume you are referring to an electronic version of the textbook which can be easily accessed on various devices.