Plants and animals that are non-native mostly are harmful to an environment. When plants and animals are introduced and they are harmful they can kill other plants and animals that are native. Although we cannot always control the invasive species that come into the specific biome there are ways to help either prevent some of them or help get rid of them. These reasons, among others, are why this biome only has pieces of the original temperate deciduous forest left.
There are however things we can do to help slow down, if not stop, the killing of these forests. One thing you can do is to recycle, and if you do then maybe recycle more. This allows less trees to be cut because less new pieces of paper are being used. Another way to help this biome is to use cloth, and not paper. When you use cloth instead of paper less trees are being cut to make paper products. Lastly you can drive less to help save the temperate deciduous forest. When you drive it creates exhaust which contributes to make acid rain which kills