It's important to understand that while the EPA does have lots of regulations that, some may argue, "suffocate" lots of sectors around the US or that environmental laws should happen at a state level and not federal, it's also important to look back and see the good that it has done to our country. One wouldn't believe the amount of knowledge one can acquire while doing just a little bit of research on Google. The notion that companies will take upon themselves to regulate themselves is naive and it has been proven that it doesn't work, if it did, the EPA wouldn't be around right now. Having states decide if they want to protect the environment or not doesn't make a lot of sense either, because air travels and water flows, so everyone will suffer the consequences at the end of the day.
There is no going back from the damage done in the past, but there are ways of minimizing environmental issues when looking ahead, when looking at the lives our future children could have.
It's a bit ironic that humans work and give everything they have in order to build something for their future generations, while not supporting the idea that clean air and water are essentials for humans to live. Without these, future generations won't be around to enjoy what their families built for them.
Even if one believes that climate change is not caused by humans, which is nonsense, what's so terrible about having a clean environment? There is absolutely no harm is trying to save the planet, regardless of who is causing the damage.