Look at a chart and you will see just how quickly the climate is changing and how we've done almost nothing to improve the situation, then why do you think it's "ok" because its "natural"? Are you nor alarmed about the mysterious force making the earth hotter? Isn't that alarming to you that we're just going along with a hotter and hotter planet? At what stage does this natural cycle stop?
Clearly, thanks to science, we know it's because of human activity, and I guess you could argue that is "natural", like our behavior is part of nature, but to pretend it's just some unknown warming force that's making the climate change seems much more disturbing to me than actually know why it's happening and addressing the issue?