We use three steps to combine expert tallies into a final vulnerability rank for each species. These are: 1) calculating a sensitivity attribute and exposure factor mean, 2) determining a sensitivity and exposure component score, and 3) Assigning an overall climate vulnerability rank.<br>First, we calculate the sensitivity attribute and exposure factor means based on the distribution of all expert tallies across the four scoring bins. We assign the low, moderate, high and very high scoring bins the values of 1, 2, 3, and 4; respectively. The attribute/factor mean is calculated as the weighted mean of the number of tallies in each scoring bin and the value of each bin (Equation 1). For example, an attribute/factor with 10 tallies in the moderate scoring bin and 15 tallies in the high scoring bin would have a mean of 2.6.
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