Bryan Leyland: Things you know that ain't so - there's a global warming "tipping point"

"Things you know that ain't so" - if world temperatures rise more than 1.5 or 2°, a dangerous 'tipping point' will be reached.

The problem with this belief is that, as far as I can make out, it is totally unsupported by any evidence whatsoever. It is not predicted by the climate models – they merely project that temperatures will increase steadily as carbon dioxide increases – and there is no evidence of tipping points occurring within what one might call the normal temperature range in the past.