Columbia subject headings:
Harvard subject headings:
Climatic changes
Climatic changes--Congresses
Climatic changes--Congresses.
Diesel motor--Alternative fuels--Congresses
Engineering economy
Environmental management
Environmental sciences
Greenhouse gas mitigation--Congresses.
Life sciences
Renewable energy sources
Spark ignition engines--Alternative fuels--Congresses.
Transportation and state--Congresses.
Transportation--Environmental aspects--Congresses
Princeton subject headings:
Climatic changes--Environmental aspects--Congresses.
Diesel motor--Alternative fuels--Congresses.
Greenhouse gas mitigation--Congresses.
Spark ignition engines--Alternative fuels--Congresses.
Transportation and state--Congresses.
Transportation--Environmental aspects--Congresses.