Abbreviation	Description
FU	Functional unit
IEA	International Energy Agency
IRR	Internal rate of return
LCA	Life cycle assessment
LCC	Life cycle costing
LCI	Life cycle inventory
moh	Medium opportunity hours
mrh	Medium risk hours
NPV	Net present value
PBP	Payback period
S-LCA	Social life cycle assessment
S-LCI	Social life cycle inventory
S-LCIA	Social life cycle impact assessment
SDG	Sustainable development goal
UNEP	United Nations Environment Programme