What is Carson contrasting in this passage?
The way humans have shaped the world in
the past and in the present
O Earth's vegetation and its animal life
The way nature affects living things, and the
way living things affect nature
The history of life on earth has been a
history of interaction between living things
and their surroundings. To a large extent,
the physical form and the habits of the
earth's vegetation and its animal life have
been molded by the environment.
Considering the whole span of earthly time,
the opposite effect, in which life actually
modifies its surroundings, has been
relatively slight. Only within the moment of
time represented by the present century
has one species-man-acauired
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DONE