Backyard nature-watchers are teaming up with scientists to track the relationships between climate and plants. This isn’t something new – about 60 years ago Aldo Leopold, who observed the plants and birds and insects on his farm, combed through ten years of journals to see how things had changed over time. He found a correlation between temperature and flower blooming.
Later, his daughter moved back to the family farm and resumed nature journaling. When scientists compared her observations to those of her father, half a century earlier, they discovered that over those decades some plants had begun blooming earlier, and some migratory birds returned earlier. Over that same period of time the earth warmed about two degrees.