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_17839_1 (future_stock VARCHAR, map_colour VARCHAR)

### Question ###
When green is the map colour what is the future stock?

### Accurate SQL ###

SELECT future_stock FROM table_17839_1 WHERE map_colour = "Green"