Energy storage
Mass production of the DIY home electricity system could be highly beneficial. It could perhaps be facilitated trough a link-up with existing car manufacturers (see and

Other projects
Other projects that facilitate a move to a sustainable society would also be cost-effective. See
* (Climate change and economy)
* (increased environmental advantage)
* (globalisation and increased urban efficiency)
* (transport)
* (political reform)
* (education reform)