How healthy is our planet’s life support system? Shockingly, we lack a clear, real-time indicator. Current measures often tell us about extinctions after they happen. We need a “check engine” light for the biosphere. Our proposed Biosphere Integrity Metric (BIM) aims to be just that. It measures the flow of energy through life’s web and how human activities disrupt it. As a first step, we are developing a Satellite-Derived Primary Production Pressure Index (SPPPI) using global satellite data. This proxy metric will provide an urgently needed early warning of human pressure on the base of the food web. While not the full picture, it is a vital start. Read on to learn how this metric works and why developing the full BIM, integrating ground truth data, is our ultimate goal.

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