According to the World Health Organisation, an estimated 1.5–1.8 million women and young children die prematurely every year due to exposure to high levels of indoor air pollution.
This is a big problem, but it is just a part of the problem.
Many NGOs have tried to address this issue by providing people at risk with solar ovens or smokeless stoves to replace wood-cooking in tradicional stoves, the cause of the indoor pollution. These actions have no doubt helped many people, but they have not solved the problem.
Like any other charitable action that leaves "recipients" dependant on external aid, this approach has very real limitations and consequently, millions of people still die from these preventable respiratory disseases.
There are other issues too, the whole wood-for-cooking scheme is unsustainable, it takes too much time to collect the wood, it promotes deforestation and it can expose women to other kind of dangers. But what to do when there is no money to buy a different kind of fuel? Is poverty the real root of the problem here?
There are many way to explore those questions, and with certainty, not just a single valid answer. My take on this is that whatever solution is devised has to consider all the related things, the cultural setting, socio-economic conditions, climatic conditions, local natural resources and most importantly, the people one is aiming to help.
When thinking about biodigesters for biogas (to use for cooking) and biofertilizer's production I am aiming for a holistic and comprehensive approach that will effectively address all these issues, and that has the potencial to address many others too and work in many different places.
Highly customizable, biodigesters can be part of the solution for lack of sanitation, respiratory health problems, climate change, deforestation, poverty, food insecurity, etc., many of which surround the same people all at once.
You can read more about how they could work here:
http://www.changemakers.com/en-us/node/67150