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- AC adapter
- AC generation
- AC vs DC
- Abrupt climate change
- Absolute pressure
- Absolute zero
- Acceleration
- Acceleration due to gravity
- Access to non-solid fuel
- Acre
- Adiabatic
- Aerosol
- Afforestation
- Air infiltration and exfiltration
- Air pollution
- Air pollution control devices
- Air pollution from oil sands
- Air quality
- Air quality index
- Aircraft reactor experiment
- Alcohol
- Algae
- Algae biofuel
- Alpha decay
- Alternating current
- Alternative fuel vehicle
- Alternative fuel vehicle infrastructure
- Aluminum
- Ambient energy
- Ammonia
- Ampacity
- Ampere
- Ampere hour
- Antarctic ice
- Antarctic ice sheet
- Anthracite
- Anthropocene
- Anthropogenic
- Anthropogenic carbon emissions
- Anti-trust legislation
- Anticline
- Appliance
- Aquifer
- Arctic sea ice
- Aromatic hydrocarbon
- Arsenic
- Ash
- Asset
- Atlantic Multidecadal Oscillation
- Atmospheric oxygen