Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_73265 ( "Gas name" text, "Chemical formula" text, "Lifetime (years)" text, "20-yr" text, "100-yr" text, "500-yr" text )

### Question ###
What is the 20 year for Nitrous Oxide?

### Accurate SQL ###

SELECT "20-yr" FROM table_73265 WHERE "Gas name" = 'Nitrous oxide'