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Books have a huge ecological(woodcutting,toxic chemicals in book production/transportation), economic(production/transportation/storage) and social(cost/copyright/DRM) impact vs free PDFs files which can be exchanged,copied and shared at near-zero cost.
Destroying the Book Industry with E-book File Sharing will create a positive impact(similar in principle to switching away from(more ecologically intensive) animal product production to plant-centric agriculture). Pirating PDFs/E-books is a revolutionary act that slowly destroys the book industry from within, removing incentives to turning trees into paper. Also remember to use Sci-Hub at every opportunity to read free scientific papers.