Commercial diverse
double
estimate
quantity
survive
reduce
restore
species
stable
Many human activities affect the health of global oceans. These many various activities are
(1)
but include fishing, manufacturing, and oil production. Pollution has increased
and in some areas we have even seen it (2)
in recent years. The amount, or
(3)
of oxygen in the water is less because there is more pollution and carbon dioxide.
Large ships such as oil tankers and (4)
fishing boats pollute rivers that empty into the
sea. Warmer water temperatures harm some fish (5)
Scientists say that some fish will
not (6)
if we don't make changes. Environmentalists (7)
that we
only have 30 years before it's too late. We must (8)
pollution and over fishing as soon
as we can to make a difference.