In this May 22, 2017, photo, tree tubes of 3.5-foot plastic protect delicate native plants and trees in a 34-acre plot at Laguna Atascosa National Wildlife Refuge near Harlingen, Texas. The test plot will determine whether the sleeves might accelerate efforts to restore native Tamaulipan thornscrub habitat to benefit wildlife, including endangered ocelots. (Rick Kelley/Valley Morning Star via AP)
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