Here are 2 answers.
1. Pollution
Poullution is one of the worst things that are damaging the environment. You can prevent pollution by for example, turning off the car when you are going to park for more than 5 minutes. Or turning off the car when you are stuck in a very bad traffic jam.

2. Landfills
Landfills are very bad for the environment. You can help save the environment by recycling things. Or if you have a ton of puffed up batteries, you can give them to a battery recycling center that will recycle them.
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