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The
importance of the oceans to life on Earth
cannot be overstated. Liquid water covers
more than 70% of our planet's surface and,
in past geological time, has spread over
85%. Life on Earth began in the oceans
over 3.5 billion years ago and remained
there for the great majority of that time.
Today the seas still provide 99% of
habitable living space, the largest
repository of biomass, and holds the
greatest number of undiscovered species on
the planet. Our oceans are vital for the
regulation of climate, and with global
warming and decreasing land area, they
have become increasingly important as the
source of food, energy in the form of oil
and gas, and for their mineral wealth.
Oceans also form a key part of the
biogeochemical cycles of carbon, nitrogen,
and other elements critical to life.
Nutrients in upwelling areas are spread by
ocean currents, and the plankton of the
seas supports a wealth of wildlife. In
this Very Short Introduction Dorrik Stow
analyses these most important components
of our blue planet and considers their
relationship with, and exploitation by,
humans. He shows how the oceans are an
essential resource to our overpopulated
world, and discusses why exploration and
greater scientific understanding of the
oceans, their chemistry, and their mineral
wealth are now a high priority. Stow also
explores what we know of how oceans
originate, and evolve and change; the
shape of the seafloor and nature of its
cover; the physical processes that stir
the waters and mix such a rich chemical
broth; and the inseparable link between
oceans and climate. As polar ice melts and
sea-levels rise, countless millions who
have made their homes on low-lying lands
close to the sea are threatened. As
scientific exploration of the seas gathers
pace, the new knowledge gained of the
ocean-Earth systems and their interaction
with the human environment is vital to our
understanding of how we can preserve these
ultimately fragile environments. ABOUT THE
SERIES: The Very Short Introductions
series from Oxford University Press
contains hundreds of titles in almost
every subject area. These pocket-sized
books are the perfect way to get ahead in
a new subject quickly. Our expert authors
combine facts, analysis, perspective, new
ideas, and enthusiasm to make interesting
and challenging topics highly readable.
.
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