. . . despite the climate scientists' best efforts at scepticism, it simply has not been possible to rule out the risk of the sort of climate changes discussed above.
Handling uncertainty is key to the scientific method, but, conversely, the existence of uncertainty is not itself cause for inaction.
This is a critical point. There is no way we can have 100% certainty about what the world will look like in 2050. But there is an enormous body of evidence, reinforced by a recent Met Office study, that suggests the need to reduce greenhouse gas (GHG) emissions is more urgent than ever. By the time we have 100% certainty, it'll likely be too late.
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