Anthropogenic effects on the climate and biodiversity of our planet are among the most troubling and perhaps irreversible threats facing scientists, policymakers, and citizens. Yet many scientists are reluctant or unsure of how to apply their expertise in basic science to these pressing real-world problems. A dozen years ago I would certainly have counted myself as one of these. I had spent twenty-five years studying how rainforest trees defend their leaves against hungry, diverse, and abundant leaf-feeding insects. With my husband and collaborator Thomas Kursar, I found that mature leaves are well defended by high fiber, making the leaves tough and low in nutrients. As a ...

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