Ineed an idea for my science fair project, me out. it has to be a research project (not experimental) and it has to relate to the real world (real world problems)

Possibly a science project about earth day. I thought of tat one because the other day, I saw lots of people throwing their trash everywhere. It is also a problem in our time and people don't understand how important it is to keep the enviornment sanitary. You could show the results of how litering affects the planet and how not litering helps the planet to thrive.

seeing the graph would

i think the answer is tomato juice? not entirely sure though