editing
It is striking that the IPCC reports' Summaries for Policymakers make constant reference to the uncertainties surrounding the projections, whereas they also give explicit warnings about the unfavourable consequences of the climate changes that are depicted as being probable. In fact, the IPCC takes a clear stand in this respect, which can be summed up as follows: future catastrophes are inevitable unless there is drastic action by man.
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Try not cliping out the rest of the statement and it makes sense.
He's saying that on one hand there's admited uncertainty in data, yet conclusions and recommendations are stated with certainty.