CLEANUP
~~~~~~~
Pollution can be cleaned up by Settler units. Move the Settler
onto the polluted square and press the P key. The settler is marked with
a "P" to note that it has been ordered to clean up pollution.

After four turns of work, the pollution disappears. Adding more
settlers to a polluted square does not speed up the cleanup.


EFFECTS
~~~~~~~
Pollution reduces the production of food, industry, and trade in
any map square where it appears. Production is halved and then rounded
up. When cleaned up, the map square returns to pre-pollution levels of
production.


MONITORING POLLUTION
~~~~~~~~~~~~~~~~~~~~
Your environmental advisors immediately inform you when any map
area becomes polluted. The area on the map is marked with smudges to
indicate pollution.

The extent of pollution throughout you civilization can be
monitored by watching the pollution indicator, a small sun in the date
window of the display. The color of the sun indicates the extent of the
risk of global warming. The colors in the IBM version range from dark
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