I came across this project by Exploration Architecture that uses EFTE as the skin of the greenhouse. This ensures that temperatures are maintained throughout the year.
The Eden Project uses EFTE - a high performance polymer that is assembled in a triple layer 'pillows' that are then inflated for structural rigidity. They were made much larger than glass and were 1% of the weight (a factor 100 saving in embodied energy). This substantially reduced the amount of steel required and allowed more sunlight into the building.
It is an extremely lightweight enclosure that is self-heating for most of the year. The weight of the superstructure is less than the weight of the air it contains.
