Columbia subject headings:
Harvard subject headings:
Commercial policy--Environmental aspects--Congresses.
International trade--Environmental aspects--Congresses.
Labels--Congresses.
Packaging waste--Environmental aspects--Congresses.
Product life cycle--Environmental aspects--Congresses.
Recycling (Waste, etc.)--Congresses.
Princeton subject headings:
Commercial policy--Environmental aspects--Congresses.
International trade--Environmental aspects--Congresses.
Labels--Congresses.
Packaging--Environmental aspects--Congresses.
Product life cycle--Environmental aspects--Congresses.
Recycling (Waste, etc.)--Congresses.