diff --git a/Alex_de_Vries.yml b/Alex_de_Vries.yml
index 7116377..5822f7f 100644
--- a/Alex_de_Vries.yml
+++ b/Alex_de_Vries.yml
@@ -25,10 +25,10 @@
 
 
 - quote: |
-    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) 
   date: 2020-12-29
   source: https://twitter.com/DigiEconomist/status/1343920982113841152