Ecospheres

What is an Ecosphere?
An Ecosphere is an enclosed ecosystem, cut off from the rest of the world. All of the components (plants, animals, precipitation) work to create an ecosystem that does not require outside interference (such as cleaning, filtration, feeding, ect...).

Sustainability
Ecospheres are very sustainable. As long as you have the right components, they can exist for months, years, even decades, and theoretically could survive forever. Like Earth, different natural events happen inside of the Ecosphere, these can include heat waves and cold waves, although these are external factors, invasive species which start to invade the environment, low oxygen levels, high levels of Ammonia, ect.

Creating an Ecosphere
Ecospheres can be quite easy to make. If you live near somewhere like a forest, pond, marshland or lake, the soil and water can be easy to find, along with the organisms that accompany them. On the chance you live near or in somewhere like a city, and still want to build an Ecosphere, you still can, as shown with the Mars Ecosphere.