diff --git a/README.md b/README.md
index c248a14..f3730de 100644
--- a/README.md
+++ b/README.md
@@ -246,10 +246,10 @@ The energy footprint per unique transaction is 690.8 kWh (enough to power 1 U.S.
 
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-Bitcoin's TWh usage results in a carbon footprint of 36.95 MtCO2 
+Bitcoin's TWh usage results in a carbon footprint of 36.95 MtCO₂ 
 (comparable to a country like New Zealand) - see bitcoinenergyconsumption.com
 
-The carbon footprint per unique transaction is 327.50 kgCO2 (equivalent to 725,861 VISA transactions) 
+The carbon footprint per unique transaction is 327.50 kgCO₂ (equivalent to 725,861 VISA transactions) 
 
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