This diagram does clearly show there's nothing but water vapor coming out of the cooling towers. They are shaped funny for a reason and aren't smoke stacks.
Yes, coal plants can have cooling towers. It's more common in some areas than others.
But the point is that Greenpeace isn't presenting that as a cooling tower. They're using it to show "all the evil pollution" coming from power plants - and the use of a cooling tower where water vapor is the only thing released is extremely misleading. They presumably chose it because the exhaust from most power plants is largely invisible and doesn't further their "power plants are evil" mentality.
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Yes, coal plants can have cooling towers. It's more common in some areas than others.
But the point is that Greenpeace isn't presenting that as a cooling tower. They're using it to show "all the evil pollution" coming from power plants - and the use of a cooling tower where water vapor is the only thing released is extremely misleading. They presumably chose it because the exhaust from most power plants is largely invisible and doesn't further their "power plants are evil" mentality.