Illicit trade in wild animals and plants is a billion-dollar global business that threatens biodiversity and human health. Endless reporting opportunities range from exposing corruption and criminal networks to debunking claims about products derived from endangered species. Journalist Rene Ebersole shares insights from her 20 years on the trail of wildlife smugglers, poachers and other environmental lawbreakers — and introduces a new nonprofit dedicated to this beat.

Sea turtles are in decline across the globe, victims of coastal development, algal blooms and, perhaps cruelest of all, plastic pollution. Marine biologist Christine Figgener, in a new book part memoir and part field guide, recounts the less than glamorous but rewarding work to spare them extinction, from arduous field work to viral video epiphanies. BookShelf editor Tom Henry reviews “My Life With Sea Turtles.”

The displacement of populations by climate impacts, while not a new phenomenon in human history, is worsening in the face of global warming’s extreme weather patterns. Yet the extensive international regime to aid refugees doesn’t cover those migrating due to flooding, drought, natural disasters or climate change. Backgrounder considers the implications and how nations will respond to the new realities.