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_29538735_1 ( year VARCHAR, tonnes_of_co2_saved VARCHAR )

### Question ###
When 1522 is the tonnes of co2 saved what is the year?

### Accurate SQL ###

SELECT year FROM table_29538735_1 WHERE tonnes_of_co2_saved = 1522