When cows excrete waste in the forms of solids and gases, they release methane gas, which increases the greenhouse effect. The greenhouse effect is where our planet is basically a green house. . The sun emits warmth, but with the greenhouse effect not all of that warmth can go back to space, resulting in a warmer planet. To live, we need it, because otherwise the planet would be too cold for us. The problem is that we're adding WAY TOO MUCH pollution to the atmosphere making it too warm. Three reasons for the greenhouse effect are:

1} Deforestation

2} Busses and cars (unless they're electric), and

3} Oil companies

In order to have a successful healthy ecosystem you have to have a solid food chain. Let's use the African plains for example. In the food chain of the African planes, there would be the plants at the bottom like grass, algae, fruit, and leaves then the things that eat them like gazelle, zebra, antelope, and okapi, then the things that eat them like lions, leopards, and snakes. Having a healthy food chain is important for the ecosystem to be healthy. The grass and plants feed the plant eaters. (Or herbivores) The herbivores keep the grass trimmed down and under control and fertilize it with their dung. They also provide food for the carnivores on top of the food chain. The carnivores keep the herbivore population under control, which makes it so there's still enough plants to go around.