A sentence from HOME - History of a journey

"In the great adventure of life on Earth, every species has a role to play, every species has its place. None is futile ur harmful. They all balance out."

I think this sentence is entirely true! The Earth has alwys been well balanced out where every being needs of others. For an example, you only have to think about the food chain. For example, in an ocean, there is plankton, which is eaten by small fish. Bigger fish eats those, and so on until the biggest ones, like tuna or even sharks. If the small organisms disappeared, the bigger ones wouldn't have anything to eat and die out. If the bigger ones weren't there, the small ones would reproduce and die much less, so there would be an overpopulation and more or less the same consequences. Of course, humans are considered to be on top of the food chain.

the problem comes when this balance is broken, like we humans do. So, considering the same example as before, we catch too many tunas. So, the smaller fish have less natural enemies as before and can reproduce more, causing the above said overpopulation. More of those smaller fish means they need more food, like plankton. So they eat and eat more and more plankton until theres nothing left. As it can't regenerate because there are too many fish eating it away too fast, those fish will start to die out, causing the organisms higher in the food chain to have no food, too. So, entire ecosystems can die out because of us catching too much of one single species.

To sum up, I think we should be cautious about nature in every way we can and be respectful with our planet, so our children and all the other generations will have a place to live as nice as ours still is.