2.15 * 10^9 g of wood is wasted each day by Americans on making paper cups.
Now we know that wood is a very important natural resource. This is in part because wood is obtained from timber and the trees from which the wood is obtained serve a lot of useful purposes such as serving as wind breaks and ultimately preventing water and soil erosion. This is in addition to serving as carbon sinks.
Thus;
If 1 paper cup requires 43 g of wood
50 * 10^6 paper cups require
50 * 10^6 * 43 / 1
= 2.15 * 10^9 g of wood
Thus, 2.15 * 10^9 g of wood is wasted each day by Americans on making paper cups.
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