es, spruce, and other species certainly find blue sky,
which means lots of sun, equally agreeable. For them,
however, the color isn’t so much romantic or moving as it is
a flag that signals, “The buffet is open.” For a cloudless
firmament means high-intensity light and, therefore, optimal
conditions f
or photosynthesis. Frantic activity for maximum
output is the order of the day. Blue means a lot of work. The
trees get full as they convert light, carbon dioxide, and
water into supplies of sugar, cellulose, and other
carbohydrates
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