module 10energy resources bcn 1582 international sustainable development overview energy terminology consumption environmental impacts renewable emerging technologies building key the capacity for doing work or heat btu wh kwh cal kcal note force x distance power rate of use 1 watt j s enthalpy internal a body entropy measure unavailable disorder exergy part that can be converted to all other forms how large quantity purely mechanical extracted from system embodied based on source used needed extract produce install and dispose product plus transport between stages emergy required make service in solar starting units by systems ecology ht odum carnot law limit efficiency engine tsource tsink t absolute degrees availability flow matter through production causes more damage than any economic activity coal oil natural gas uranium pollution waste