The earth as we know it, is always evolving, so every minimal act that we perform for it, can make a change. To create a story about a hero, I would use a park as the setting. I would catalog as a villain, anyone who throws garbage, as it directly affects our ecosystem and contributes to the destruction of the planet. A hero in this case, would be that person who is inclined to pick up garbage, or who performs the proper recycling of these. Directly, it contributes a grain of sand to protect our planet, and indirectly saving the lives of us all. The main value found here is education, so important to substise and lead a harmonious life.
Why treat them any different? We're all humans... We all like different things.
just did it and it is the second one, num'rous nations sway ev'ry evil fly
I believe the correct is the third option. It is important to preview sources before using them in your research because it reveals deeper concepts. Reading deeply the sources would allow you to have a deeper understanding of the sources and determine which parts of the sources are useful to your research.