brown build house Coconut branch Coconut leaves cool dry grass Eco-friendly environment insulator low-cost rural rustic shade shelter skill sustainable temporary thatch thatch palm Thatched Roof thatching weave biodegradably-slow cheap chemical discardable disposable empty environmentally-unfriendly EPS expanded-polystyrene-foam foamed food-plate hazardous-waste inexpensive insulating lightweight monomer-styrene plastic plate pollutant pollution polystyrene PS substance synthetic-hydrocarbon-polymer toxic-waste unused widely-used