The Debate is yet to be. Lord Monckton almost found one in 2009.

Despite much resistance, Lord Monckton has persisted in his efforts to initiate an open and free debate on the causes and extent of Climate Change (the relative impact of natural or human causes; the nature and extent of so called unprecedented, dangerous and runnaway global warming; the scientific value of models uncalibrated with observations and evidence from the natural world).

An earlier attempt to discuss things freely in debate is still instructive and illustrates the difficulties some have with a view well founded evidence which conflicts with their scientifically unsupported 'world view'.

See (here) for the debate generated by Christopher Monckton of Brenchley and Paul Maynard with Dr. Andrew Dlugolecki, a contributor to the UN’s climate reports.