If a man doesn't care about the environment, what does that say about him? For women, this could mean a number of things, including not having dad potential and not being able to keep things tidy around the house (both important qualities from earlier in the article). However, most importantly, it shows he doesn't care about the world we live in.
A man who cares about the environment is extremely attractive. We're not just talking about doing the recycling once a week, either. A man who is educated about climate change, who picks up other people's trash when he sees it, and loves plants and wildlife is a good man to have around. If you're not totally invested in the health of our environment, maybe you should start learning and develop a passion for it.