1. We can provide them food, warm clothes,...
2. We can help them clean their house, do the gardening, etc.
3. We can recycle bottles, papers,... and teach others how to do so. We can clean the streets, school, beach,...We also can plant more trees in the neighborhood.
4. We have to obey the traffic laws. We must provide public transportation, restricted personal transportation.
5. We have to keep trees, use natural materials, unplug the plug from the outlet, use clean energy, do the 3R principle (reduce, reuse, and recycle).