CAMPAIGNERS yesterday attempted to pour scorn on “tenuous” global warming theories by issuing a dossier detailing 100 reasons why climate change is natural and not man-made.

The list includes the controversial claim that there is “no scientific proof” that rising levels of greenhouse gases are caused by human activity.

**SEE THE 100 REASONS HERE**

The key decision on preventing catastrophic climate change will be delayed for up to six years if the Copenhagen summit delivers a compromise deal which ignores advice from the UN’s science body.

World leaders will not agree on the emissions cuts recommended by the Intergovernmental Panel on Climate Change (IPCC) and are likely instead to commit to reviewing them in 2015 or 2016.