THE WEIGHT OF NATURE

This is your brain on climate change.

In his second book, neuroscientist and environmental journalist Aldern examines the palpable effects of climate change on our brain chemistry, including not just increased anxiety, stress, and depression, but also detrimental changes in decision-making abilities and judgment. Paraphrasing a climate advocate in California’s Central Valley, the author writes, “planetary empathy is rooted in pain: the aches and grimaces of a world grieving not just the loss of species and an unspoiled troposphere, but also the loss of the way time once passed and the seasons once progressed. It is the sorrow of glacial ice bearing water for the last time; seas unable to hold their vapors close; the erasure of whole fluvial languages once carved into riverbeds.” As a result of all this loss, notes Aldern, “the shadows of stress loom,” generating in our bodies a torrent of hormonal responses that prompt “relentless cortisol storms” and altering the landscape of our brains—e.g., via the gradual shrinking of the hippocampus. Furthermore, neurotoxins—which can lead to a vast array of serious health concerns, including Alzheimer’s and ALS—are being released in increasing amounts due to the drastic changes in the climate, which include expanding bacterial and algal outgrowths, melting permafrost, and accelerating swarms of virus-bearing mosquitos. The chronic stress we feel as we lose seasons, coastlines, farmlands, and mountaintops is literally changing our brains’ “structure and function, leading to memory problems, mood disorders, and heightened anxiety,” all of which have ripple effects on those around us. As Aldern demonstrates throughout this distressing yet urgently necessary book, climate change is affecting the very duration of our lives. This is a unique—and uniquely disturbing—addition to the literature.

A lyrical and scientifically rigorous account of the emotional and physical toll climate change is taking on the human brain.