Evidence: Start of Spring

“Start of Spring” is one of 14 climate change indicators. It tracks the start of spring for each year, using model estimations of when enough heat has accumulated to initiate growth (leafing and flowering) in temperature-sensitive plants. Observed changes in the start of spring reflect the overall warming trend in the climate system. (U.S. Global Change Research Program)

Photo ©2017 Jen Payne, from the upcoming book Evidence of Flossing: What We Leave Behind.