These are the 6 highest impacting topics, in order. 

Of all the topics in the taxonomy, these have the most impact over the whole time period selected. These topics are likely to be of high importance as they are driving the highest impacting conversations. 

If not already being acted upon or you are not yet aware of the prominence of these topics, they may possibly warrant further investigation.
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It is important to note that the scales across each of the 6 Topics are different.