The Bridge House Trust is reviewing 12 London-based voluntary organisations in a bid to make them more environmentally friendly.
The trust has employed environmental consultant Donnachadh McCarthy to assess the management of each organisation and the use of its facilities.
He collected data on waste, energy use, water, transport and carbon emissions.
The NCVO, the RNID and Centrepoint are among the organisations taking part in the £15,000 project.
"Many charities have taken on bouts of activity on eco-issues," said McCarthy. "But once the enthusiastic member of staff has moved on there may be nothing in place to sustain the momentum. Our intention is not only to make tailored suggestions, but to ensure environmental responsibility is embedded in the management systems of charities."
McCarthy is producing a written report for each organisation with recommendations for changes of practice to make them more environmentally efficient.