How Pollution Affects:
The air: it can clog cities with smog, making it hard to breathe. This can also mess with rainfall, because raindrops are water droplets that form around tiny particles of dust or smoke, the latter of which creates acid rain.
The land: Acid rain can rain down onto plants and animals, giving them chemical burns and stripping trees of leaves and bark, leaving decaying organic matter behind.
The water: Pollution in the water can cause the pH (acidity or basicness) of the water to change. A lot of organisms can't survive too much swing in either direction of the pH scale, so they will all start to die, except for a few outliers that can handle it, who's population explodes and completely take over the aquatic ecosystem.