Climate change can be measured — without leaving your backyard

Tove Danovich is a writer in Portland, Ore., and the author of “Under the Henfluence: Inside the World of Backyard Chickens and the People Who Love Them.” Yan Wu is a Post Opinion graphics reporter.

Hardiness zones indicate where plants can grow, based on the average annual extreme minimum winter temperature.Note: 2012 data is unavailable for some ZIP codes. Some ZIP codes may not be accurately geocoded due to data limitations. People in Arkansas can now think about planting mandarin oranges in their gardens. New Yorkers might shy away from planting native sugar maples that prefer a cooler temperature. Gardeners in Massachusetts can consider planting cold-hardy camellias outside. We’re used to tracking climate change as a series of disasters — heat domes, deep freezes, glacial melting, floods, and fires — but the subtle signs of it have been in our backyards all along.

The records Thoreau made during his daily four-hour walks around the pond during that time and beyond have become vital to scientists studying climate change. He noted the dates that various species of bushes and deciduous trees sprouted leaves, when wildflowers bloomed, and the arrival dates of migratory birds.Researchers monitored 43 woody plants for five years in Concord, Mass., and found that they are leafing out earlier, as are flowers’ bloom and birds’ migration dates.

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