Authors have assigned a confidence level to the major statements in the Summary for Policymakers on the basis of their

assessment of current knowledge, as follows:


Degree of confidence in being correct

Very high confidence

At least 9 out of 10 chance of being correct

High confidence

About 8 out of 10 chance

Medium confidence

About 5 out of 10 chance

Low confidence

About 2 out of 10 chance

Very low confidence

Less than a 1 out of 10 chance

Description of likelihood

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