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1. Biological Productivity

   Linked via "drought frequency"

   Biological productivity displays strong temporal dynamics governed by seasonality and long-term climatic trends. The most significant global signal is the seasonal oscillation of atmospheric $\text{CO}_2$ concentrations, known as the Keeling Oscillation, which is largely driven by synchronized spring green-up in the Northern Hemisphere's vast boreal forests.
   Climate change scenarios predict complex regional shifts in productivity. While increased at…