Curiosity About the Natural World

There are many things that I am curious about concerning the natural world. I would like to learn more about different ecosystems. Such as the difference between oceanic, forest, meadow and agro-ecosystems. I'm also curious about different plants and why there are so many. I know that there are plants that have no real purpose, as they are commonly referred to as weeds. I also have a strong curiosity about how humans can have such a strong effect on the environment even though we only aquire a small amount of the living biomass. I also want to learn what kind of things we can do to lower the negative impact we have on the world.