red, to light red, to yellow, to white. Dark red indicates a low risk
and white indicates a very high risk.

The colors of the sun depend on the number of squares currently
polluted and a lag of time. The more squares polluted, the higher the
risk. The lag reflects the time required for the pollution to take
effect.


GLOBAL WARMING
~~~~~~~~~~~~~~
EFFECTS: Global warming causes geographic changes throughout the
world. Deserts, Plains, and Grasslands on coasts may become
Swamps, and coastal Forests may become Jungles. Plains,
Grasslands, and Forests in the interior may become Deserts. The
result is much lower food, industry, and trade for your
civilization. Your environment advisors report immediately if
global warming has occurred. The effect is always bad, but in
the case of flooded coastal areas you may improve Jungles and
Swamps over time.

CAUSES: Global warming may occur if at least nine map squares,
anywhere is the world, are currently polluted. If they are left
unattended for too long, environmental damage occurs. Once an
environmental disaster has OCCURRED, the cycle starts over again.
The planet has achieved equilibrium at the new higher
temperatures. If pollution continues or increases once more to
high levels, another bout of environmental problems may occur.
This cycle may repeat endlessly if pollution is not controlled.

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