Global Warming

2827 words - 12 pages

Intro Sample...


The relationship between humans and the state of the ecosystem is not only
dependent upon how many people there are, but also upon what they do. When there
were few people, the dominant factors controlling ecosystem state were the
natural ones that have operated for millions of years. The human population has
now grown so large that there are concerns that they have become a significant
element in ecosystem dynamics. One of these concerns is the relationship between
human activities and climate, particularly the recent observations and the
predictions of global warming, beginning with the alarm sounded by W. Broecker
(1975).

The relationships among humans, their activities and global temperature can be
assessed by... View More »

Body Sample...


A vertical dashed-line has been placed at 1995. Filled symbols for the
known values are to the left of it and open symbols on and to the right of it
are for values projected into the short-term future.

The first surge coincides with the beginning of the cultural revolution about
600,000 years ago, interrupted by the population crash 65,000 years ago.
Population size rebounded 50,000 years ago and then growth slowed considerably.
The second surge began with the agricultural revolution about 10,000 years ago
and was followed by slow growth. Deevey argued that moving down the food chain
was the underlying cause of this large and rapid spurt. The timing of the
present surge matches the rise of the industrial-medical revolution 200 years
ago.

A relation between innovation and population growth is embedded in the log-log
plot. There was rapid growth at the start of each surge. Then, growth rate
slowed as people adapted to the precipitating innovations. Each surge increased
the population more than 10-fold. It appears that we are nearing the end of the
present surge as recent growth rates have declined. After the initial spurt,
subsequent innovations did not perpetuate growth rates. The only significant
innovations were those that produced the next surge. However, accumulated
innovations during the surges may have played a role in the eventual decline in
population growth rates. Starting with high birth and death rates, death rate
declines and longevity increases, but birth rates stay high. Some time later,
birth rates decline so that ...

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