f625 029 000

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WAIVER OF LIEN BY CONTRACTOR, SUBCONTRACTOR(S) AND SUPPLIER We, the undersigned, acknowledge receipt of the amounts stated below as full payment for all labor, professional services, materials, or
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-The air and water enveloping our planet's surface are in constant motion It's a complicated ballet of winds and currents influenced by the sun the moon and basic physics distributing oxygen water and nutrients to all the planet's life forms from the smallest phytoplankton all the way up the food chain to you and me Now what drives all thesis heat -- the heat of the sun And although the scale of all this movement is unimaginably vast the smallest change in the earth's temperature even a single degree can throw the whole thing out of balance Here's how It begins with the air The heat of the sun warms it Warm air rises then it cools sand sinks back to Earth a rising and falling flow in what are known as convection cells The sun warms the earth most directly at the equator so these cells Hadley cells are the main engine driving all the rest of it Meanwhile the earth is rotating imparting a circular motion to the air as it cool sand sinks This is the Coriolis effect And the wind drives the water generating rotating ocean currents known as gyres And this is where things get interesting especially in placeslike West Africa Because there's more going on here than just the gyres I told you this was complicated The winds and currents move water away from the African coast which forces upwelling -- cooler nutrient-rich water moving up from the depths to replace the water that's flowed away These nutrients feed plankton The blooms of plankton feed fish The fish feed --you guessed it -- people Economies and diets depend on this But now look what happens as the planet warms With more heat the Hadley cells expand The whole system pushes toward the poles The winds and currents don't affect places like coastal Angola as much any more, so the upwellings greatly diminished The nutrient-and oxygen-depleted water can't support nearly as many fish and in this and many other ways the well-being of the humans at the top of this food chains severely impacted by something as sim pleas a few degrees of temperature
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