BBC's Richard Black on farcical climate models: "Dry Egypt could be better off by 100%, or worse off by 206%."; "As a policymaker, as a business leader, as a citizen, would you make decisions on the basis of these models?"

BBC News - Climate models yield confidence question

The [UK] flooding picture, however, is different, with estimates ranging from a 56% reduction in flood risk to a 180% increase.

Looking into other countries, even bigger discrepancies materialise.

The change in flood risk to Bangladesh - surely one of the most flood-prone countries in the world even without climate impacts - ranged from -59% to 557%

Dry Egypt could be better off by 100%, or worse off by 206%.

And an eagle-eyed colleague spotted that the proportion of Peruvians likely to be under more serious water shortages was calculated to be a round 0%.

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As a policymaker, as a business leader, as a citizen, would you make decisions on the basis of these models?