diff --git a/README.md b/README.md
index a8bdcf5c9b486725aa66b28d3d5ff84c80a116cb..f8a392e01d768f778d4b6d1168c8a346a4a9e4b7 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,7 @@ Patricia
 - The concept of Plastic Waste Footprint (PWF) can be used as a metric for environmental burdens, to compare alternative solutions on plastic production & waste management: the total mass of plastic waste generated by a process/product or service minus the amount of plastic avoided /reused / recycled / reprocessed. 
 - Further research:
     - Collect data on PPE Lifecycle: CO2/GHG emissions of PPE generation & waste management
+    - Is it sustainable to use PPE as an energy source?