Air pollution can cause diseases and harm crops. Insects are often the first creatures to be affected by pollution. They are usually exposed to pesticides and chemicals. Birds then eat these insects, get poisoned and die. Small animals are harmed by pesticides.
Field mice eat seeds that have been exposed to pesticides.
Then, larger animals such as foxes and hawks consume the smaller creatures and eventually die too, due to accumulation of so much poison in their bodies. Fill the jar with water. Put the cutting in the jar and place in a sunny location. Check daily to make sure the stem has enough water. Wait and observe regularly for the roots to grow.