The of Radiation, Fossil Fumes and illegal Fuel Dumping can affect the wildlife patterns such as fish leaving or not entering curtain areas.

trees losing there leaves, grass losing its colour and fish bones washing up on shore etc

If a Nuclear Warhead crashes and explodes the trees loose there leaves and ash falls from the sky

Or if a Normal Warhead detonates on the ground it it creates a crater and moves/ knocks over all the trees.