Andrew Grover#WarIsARacket รีทวีตแล้ว

The tree in your yard is running a natural cooling system right now.
On a hot summer day, a mature tree can pull around 100 gallons of water up from its roots and release it through its leaves as water vapor. As that water evaporates, it carries heat away from the leaves and cools the air around the canopy.
That's only part of the story. The shade from the crown keeps sunlight from baking the ground below, while transpiration adds another layer of cooling. Together, they can make a yard with mature trees noticeably cooler than the pavement and treeless lawns nearby.
Your tree has been moderating summer heat, reducing temperatures, and making your yard more livable every day since before you moved in.
The best time to plant a tree was twenty years ago. The second best time is before the heat waves come back next summer.

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