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True. But there's also the questions if long term investments will or won't provide better results over long term than just looking for what's best for short term.
The foam insulation may seem like the best choice now since it has the highest insulating value and also seals air and moisture out. But in the long term it will slowly lose its insulating value and isn't a good material in the face of an unforseen fire which could end up costing more in the long run than say mineral wool.
There's also the benefit of pride of doing what's better for the environment and others than for just yourself. Mineral wool is made of organic and recycled materials whereas foam is made of harmful chemicals and plastics.
Not that I'm an expert and know that for a fact solar panels on a car are better for the environment than an alternative. I guess the question is, what alternative are we talking about?
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