Cooking is a universal human behaviour that has been proposed to function partly as a mechanism for increasing dietary net energy gain. (novaholisticjournal.com)
We need to know definitively how much net energy gain these alternative energy systems are providing. (dotearth.blogs.nytimes.com)
We have to get it right the first time and once we actually know what works and what doesn't (in terms of producing net energy gain) then we can decide on policies like subsidies to get to economies of scale. (dotearth.blogs.nytimes.com)