What concerns me more though is that the debate continues. Regardless of whether humans or nature are responsible or a combination of the two, the reality is that the climate is changing. If we assume for a moment that humans are not responsible, are we really prepared to accept the climate changing. If it continues to change in this way, we are going to be seeing more extreme weather and we are going to see higher sea levels. This seems indisputable to me. So, sit back and do nothing if humans didn't cause it and do something if we did? That seems utterly mad to me.
Don't misunderstand, I realize there are dangers in deciding that we do want to try and improve the climate but it seems to me that that is the debate we should be having as well.