CREATE TABLE table_73264 ("Gas name" CLOB, "Chemical formula" CLOB, "Lifetime  ( years ) " CLOB, "20-yr" CLOB, "100-yr" CLOB, "500-yr" CLOB)

What is the 100 year for Carbon Dioxide?
SELECT "100-yr" FROM table_73264 WHERE "Gas name" = 'Carbon dioxide'
SELECT "100-yr" FROM "table_73264" WHERE "Gas name" = 'Carbon dioxide'