Forests or trees might be considered a
non-renewable resource if they are cut down faster
than they grow back. Many people think that the
best wood is called "heartwood." This is
the kind of wood that grows deep down in the
middle of very old trees. If trees are lot allowed
to grow for many, many years before they are cut
down, we cannot get heartwood from them. If we cut
them down too quickly, we'll end up with
grasslands instead of forests, and there will be
no trees left at all.
Another danger to cutting
trees down too quickly is that the loss of forests
could permanently change the environment
there. For example, maybe an animal that used to
pollinate the trees or help spread its seeds will
disappear when the forest disappears, then even
new trees will have trouble reproducing. Or maybe
the trees will only sprout in the shade, and the
shade all disappeared when the forest disappeared.
There are many more examples of how harvesting
trees too quickly can cause big, permanent
The way to preserve forests as a renewable
resource is to cut fewer trees down. For
that to work, people would need to find other
materials that could be used in place of new wood
(like bamboo, fiberboard made from wood chips,or
recycled lumber), or we would need to devote more
land to growing trees.
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