I'm pretty sure my health is the most important thing I possess. I am reminded how important it is when it falters. I won't say that nothing else matters, but I wouldn't want to be rich if it meant I would have to sacrifice my good health.
Our priorities show in our actions. Because I value my health, and try not to take it for granted, I exercise, watch what I eat, and I care about my environment. Some people might call me a tree hugger. I won't deny that I have hugged some trees, and I am an environmental activist. Yes, I'm one of those people. I don't understand why anyone wouldn't be.
I've heard of people who are so removed from their natural environment that they are afraid of it. I can't say that it doesn't pose some hazards. However, it also seems obvious to me that we are a product of our environment, so an unhealthy environment means unhealthy people. If you're breathing dirty air, or drinking polluted water, your body will pay the price. Maybe it won't be immediately noticeable, but the effects can be cumulative.
Many people become environmentalists when industrial pollution moves into their neighborhood and starts making them sick. I would encourage everyone to be more preemptive. Don't wait until your health begins to fail to take steps to protect it. Go outside, breathe the fresh air, and don't assume it will always be that way. Plant a tree, and watch it grow. That tree will provide oxygen for you and your loved ones, in addition to shade, protection, and carbon storage. You might even want to give it a hug.