Many modern cooling towers are wide at the bottom, narrower in the middle, and wide at the top. This called a Hyperboloid.
This has two advantages. It is easier to construct and takes less material. This shape also accelerates the normal rising airflow.
Plants use cooling towers to recirculate most of the water they use. A plant might use up to 100,000 cubic meters an hour. That could kill millions of fish per year who get sucked into the intake filters. The warm exhaust water can alter the lake/rivers ecosystem.
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