Patrick of Singapore has a point about rain-forests being our planet's "lungs": they breathe in carbon dioxide and breathe out oxygen, without which we cannnot survive. If we have to pay for their maintenance and prevent them from being felled, then we will have to dump the phrase "as free as air".

Edmund Burke, Kingston upon Thames, England

Any Palen-tologist will tell you these so-called fossils are fakes intelligently designed to mislead the unbeliever.

John Ledbury, Kings Lynn, England

It is well known that climate has been fluctuating over millions of years. Naturally, not man couse all that. But it does not mean that we should continue to pollute our planet. In many cases man is the primary reason of some animals`s extinction etc. We must think what we are doing with Earth

Elena, Moscow, Russia

Was man around 300m years ago? Just because trees naturally fall doesn't mean we should discount the lumberjack walking through the shot. What are you so scared of, would you have campaigned against the clean air act? Progress is usually a good thing, relax people.

Peter Bose, Edinburgh, Scotland

It seems that there were some mighty big earthquakes that could cause the sea to bury massive inland forests with millions of tons of sediment. What real evidence is there of this?Could this be evidence of a global catastrophy - a global flood even?

David , Bournemouth, UK

the point missed in the article is that this happend 300 odd million years ago and the climate change was far more intense than what it is now. why do we keep blaming climate change on humans when its clearly a natural phenomenon?

will, grimsby, uk

Global warming 300m years ago!
Who caused that then?
Probably the same thing that is causing the 'alleged' global warming of today.

Jim, Cardiff,

Was the global warming 300 million years ago caused by human activity ie greenhouse gases CO2, CH4 etc or was it an entirely natural process with no human input ???

Peter Hooper, Windsor, UK

So who caused global warming 300 million yrs ago then - NOT MAN !!!!!!!!!!!

ian payne, WALSALL,

How shameful of the animals and creatures living 300 million years ago for not switching to Hybrid cars to avert this disaster. If only they had thought about their actions....

Matt, Houston, USA

Global warming does not cause the demise of rainforests, rather rainforests are instrumental in climate change. They are our planet's lungs and pores so why the hell do we keep bulldozing them? Rubber and Palm oil are no substitue for the indigenous flora and fauna of the planet

patrick, Singapore, Singapore

Oh, sorry, if Palin and her ilk are to be believed, these have just been put there for a laugh a couple of thousand years ago.

Paul Downes, Milton Keynes, UK