Al Gore said on Wednesday it would be "insane, utterly mad and delusional in the extreme" to turn to geo-engineering projects to avoid a climate catastrophe.

Excerpt only - Go to Website for full article:

On geo-engineering Gore drew a distinction between small-scale interventions, such as white roofs, and large-scale projects meant to extract or neutralise emissions from the air or block the sunlight. Those ideas, he said, carried enormous risks.

"The most discussed so-called geo-engineering proposals – like putting sulphur dioxide in the atmosphere to reflect incoming sunlight – that's just insane. Let's just describe that clearly – it is utterly mad," Gore told the conference call.

He warned that such large and untested experiments carried enormous risks while "doing nothing to address other consequences of climate change such as ocean acidification".

He said: "We are already engaged in a planet-wide experiment with consequences we can already tell are unpleasant for the future of humanity. So the hubris involved in thinking we can come up with a second planet-wide experiment that would exactly counteract the first experiment is delusional in the extreme."