Environmental Problems. The problem is, not to mention it. Expansion of industry and the cutting down of many trees and leaching chemicals into the groundwater, river and sea. Causes of air toxicity and spoiling. The effects of environmental pollution on humans are mainly physical. The troubles to humans are respiratory, in the form of allergies, asthma, irritation of the eyes and nasal passages, many cities the weather gets hot. As for animals, plants, and especially trees, can be destroyed by acid rains. Advances in science and technology causing ecological damage quickly.