Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Year', 'Universities', 'No. of Students Signed up', '% electricity reduction', 'Tonnes of CO2 Saved', '£ Saved']

### Response:
SELECT Year FROM table WHERE Tonnes of CO2 Saved = 1522