Update README.md

README.md

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 ## Overview  
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 **RIME** is a lightweight software tool for using global warming level approaches to link climate impacts to Integrated Assessment Models (IAMs).
 When accompanied by climate impacts data (table and/or maps), RIME can be used tot ake a global mean temperature timeseries (e.g. from an IAM), and return tables and maps of climate impacts through time consistent with the warming of the scenario.