We've mentioned deforestation a couple of times already on this list, but nothing brings it home like seeing the effects of it with your own eyes. Every stump you see here was once a tree; a tree that in some cases would have stood in place for centuries, producing flora and playing host to many different forms of wildlife. Now they're all dead, useless and forgotten. As a result, so is the land around them.
As well as being a producer of oxygen, trees also extract carbon dioxide, which cleanses the air we breathe. If we do away with too many trees, our own planet's atmosphere will become poisonous to us, and we'll choke. You could make a case that we deserve it, but it would be better to avoid the problem entirely by not cutting down trees on such an industrial scale. The ecosystem of this area has been lost forever because of the deforestation activity.