This image above is a system diagram for biogas in India, with system diagram, we can better understand the relationship between system’s components. In the diagram, we can see that how biogas affects ecosystem and social system, biogas generator uses locally accessible cow dung to produce clean methane gas, and the “leftover” slurry can be used as organic compost, which should be seen as a sustainable development since it doesn’t compromise the resources of the future generations. When comparing my diagram to the one in “What is Human Ecology?”, the same part would be that we both use arrows to show the effects, the different part would be that I use the procedure of producing biogas as a “tree trunk” and present the effects in two categories, but in the reading the author list the major topics under the two categories and find the relationships between the topics. I think the reason why we have differences and similarities is that we both know arrow can help us clear our thoughts and trace the chain of effects, but we have different ways to arrange the information. By comparing the diagrams, I think I would focus more on the correlation between different effects rather than just listing them under different categories, and I would also consider sing line arrows since it makes the diagram cleaner.