The Health of Our Planet

Over the last few months I have been picking up on bits on and in the news regarding such topics as; The unreliability of global warming statistics and therefore the unreliability of future predictions as to how Our Planet will be effected by Global Warming; The effect of carbon dioxide on ocean life; Over-fishing in The Atlantic Ocean, Items such as this, combined with a general increase in my interest on these matters or even an absorption of them into my conciousness, coupled with my increased awareness of scepticism that exists towards Global Warming, or even just 'Global Health', has prompted me to broach the subject on 'The Health of Our Planet'.

My initial reaction on the current state of affairs is one of mild horror, specifically regarding 'Global Warming Theory' to coin a phrase if it or one similar doesn't exist already, that 'They', the detractors, stand so resolutely and stubbornly in the way of a process of change that may 'save' our planet. I wish to look into exactly what the detractors are saying? And so...

• Is what 'they' (the detractors) are saying based on any scientific evidence or indeed, based on the lack of convincing scientific evidence for the case of Global Warming? 
• And if it is the latter, is it merely opportunistic haranguing, by parties that have a vested interest, of bodies that were up to now deemed as unbiased-purveyors-of-the-truth?
• Do the parties against the case of Global Warming have a legitimate argument?

Seems a good a place as any to open a discussion on 'The Health of Our Planet'... Once again, all comments welcome :)