Imagine your company has more than 16,000 buildings in the UK alone, many built years before energy efficiency became a hot topic for corporates, and some that predate the industrial age altogether.
How would you even begin to start lowering their energy consumption given that each and every one of those buildings is an independent entity in control of its own operation and finances?
This is the precise challenge facing David Shreeve, environmental adviser to the Church of England, who has to steer the Church towards meeting its self-imposed goals of reducing greenhouse gas emissions 42 per cent by 2020, before then delivering an 80 per cent reduction by the middle of the century.
A goal easily attained by shutting out the lights as people leave.