Save paper:
Print only when necessary.
Think about the environmental impact before printing.
Read and file documents electronically.
Print in batches and double sides to reduce the time printers are idle.
Turn off the printers when not used.

Save electricity:
Computers
Switch off your monitor during lunch time and after office hours.
Switch off your PC completely when leaving the office.
Lighting: Switch off lights in offices, meeting rooms and toilets when not in use. 
                 
Save water:
Turn the tap off when not in use.
Avoid spilling water.