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"From pollution to public health, the life-threatening challenges that we were warned about decades ago are no longer conceptual concerns that our children and our grandchildren may face one day... Fortunately, however, there is a steady and trustworthy solution we can turn to. No, not our centralized political or economic leadership: decentralized digital technology." This price is for the Kindle edition. This book is also available in paperback for $24.99. No audiobook yet, but we'll keep checking!