Start by raising awareness within the congregation. 
 

Within the property and without any expenditure; consider switching off some lights and the correct level of heating; reuse, reduce and recycle whenever possible; reduce waste and consumption.
 

With minimal expenditure; carry out regular maintenance; install low energy lights;
 

When planning building improvements; improve the insulation; change the type of heating; look for greener energy suppliers; consider solar power (already planned for two churches in the Synod.

                                             
                                 Photovoltaic cells in a new roof
 

Ask the congregation to consider their personal life styles. Walking to Church saves fuel and is better for you.  Switch off  when not in use (includes your car engine).  Sharing lifts, driving more fuel efficient cars and flying less will make a very positive impact.  Use the phone and consider conference calls rather than having meetings. Consider food miles.