Ensuring that the users printer default is set to the most economical printer
Mains timers on printers
Buying lunches/sandwiches for meetings at supermarkets
Checking and calibrating outside PIR activated halogen spotlights
Reminding people to use the duplex unit on the printers
Reducing the cooling in our server room by 2 degrees
Having a central controller for air conditioning and heating
Reducing the frequency of window cleaner visits
Cancelling the plant contract and buying our own
.....