Open source software has a big role to play in sustainable development. In the closing session of last month's FOSS4G conference, the committee that will be hosting next year's conference in Capetown (congratulations!) reminded us that the South African government is committed to open source software. Getting locked into buying proprietary seed is not the way to sustainable agriculture, and getting locked into buying boxed proprietary software is not the way to sustainable digital enterprises. Where is the sustainability media on the subject of open source?