Pollution. There is so much pollution from the synthetic things that humans have created. A lot of disposable products sit in landfills and rot the Earth. Products that are not biodegradable are created simply to make money off of them. They are cheap to create and the process of creating them from start to finish pollutes. More roads, buildings, etc are wiping out our planet slowly but surely. Animals, trees, land, and water as we speak are being wiped out for our so called progress. There are a lot of helpful things that have come out of progress, but it seems for every one helpful thing there are 20 hurtful things that pollute.