For an indie developer overheads can be close to zero, development costs are cheap and there is no reliance on retailers having shelf space for your product.

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Called Zero Hunger, the national development programme has been designed to help mainstream rural Nicaraguans.

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Cut development expenses to zero, switch to dated but cheap technology, under-depreciate, change pension fund assumptions, bleed non-executive salaries and defer benefits etc.

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"We developed these carbon zero homes from the design and development stage through to people living in them, " said Professor Mark Gillott, of the University's School of Architecture and Built Environment.

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But Jose Guillermo Justiniano, the development minister, says that in the Chapare, zero tolerance will continue.

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Eco-towns, intended to tackle the twin problems of housing shortages and climate change, have to be carbon zero as a whole, be an "exemplar" in one area of environmental development and have at least 30% affordable housing.

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