- Abiotic Depletion
- Acidification
- Advanced Biological Treatment (ABT)
- Advanced Thermal Technologies
- Aerobic Process
- Air Emissions
- Aliphatic Aromatic Polyester
- Aliphatic Compound
- Aliphatic Polyester
- Alternative Conversion Technologies
- American Society for Testing and Materials (ASTM)
- Anaerobic Digestion
- Aromatic Compound
- AS 4736
- ASTM D5338
- ASTM D5511
- ASTM D5526
- ASTM D6400
- ASTM D6868
- ASTM D6954
- ASTM D7081
