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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 electricity
- Access to non-solid fuel
- Acid
- Acid rain
- Acre
- Adiabatic
- Aerosol
- Afforestation
- Agricultural energy use
- Air
- Air conditioner
- Air infiltration and exfiltration
- Air pollution
- Air pollution control devices
- Air pollution from oil sands
- Air quality
- Air quality index
- Aircraft reactor experiment
- Albedo
- Alcohol
- Algae
- Algae biofuel
- Alkane
- Alkene
- Alkyne
- 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
- Atmosphere
- Atmospheric oxygen
- Atom
- Atomic mass
- Atomic mass unit
- Atomic number
- Atomic weight
- Avogadro's number
- Avoidance cost
- Axial tilt
- BRIC
- BTU/hour
- Band gap
- Bar
- Barrel
- Barrels of oil equivalent
- Base (chemistry)
- Baseload power
- Battery
- Bcm
- Becquerel
- Benzene
- Bernoulli's equation
- Beryllium
- Beta decay
- Betz limit
- Beyond design basis accident
- Big Bang
- Bioaccumulation
- Biodiversity
- Bioethanol
- Biofuel
- Biomagnification
- Biomass
- Biome
- Biosphere
- Bitumen
- Bitumen upgrading
- Bituminous coal
- Black swan theory
- Blackbody radiation
- Boiler
- Boiler slag
- Boiling point
- Boiling water reactor
- Boltzmann's constant
- Boron
- Bottom ash
- Braking
- Bramble Cay melomys
- Brayton cycle
- Breeder reactor
- British thermal unit
- Building envelope
- Butane
- CANDU reactor
- CFL light bulb
- CO2 equivalent
- CO2 footprint
- C vs CO2
- Cadmium
- Calcium
- Calorie
- Calutron
- Cam
- Cambrian
- Camshaft
- Canada residential energy use
- Canadian Energy Security
- Candela
- Cap rock
- Capacitance
- Capacitor
- Capital
- Carbohydrate
- Carbon
- Carbon capture and storage
- Carbon cycle
- Carbon dioxide
- Carbon farming
- Carbon flux
- Carbon monoxide
- Carbon pool
- Carbon sink
- Carbon tax
- Carbon tax vs emissions trading
- Carboniferous
- Carnot efficiency
- Cartel
- Cascade process
- Catchment
- Celsius
- Centrally planned economy
- Centrifuge
- Cesium
- Cetane number
- Charcoal
- Charge carrier
- Chemical
- Chemical bond
- Chemical chain reaction
- Chemical energy
- Chemical isomer
- Chemical reaction
- Chernobyl nuclear accident
- Chimney
- Chlorine
- Circuit breaker
- Climate
- Climate change
- Climate change consequences on rainforests
- Climate feedback
- Climate forcing
- Climate impacts of oil sands
- Climate scenario
- Climate simulation ensemble
- Climate system
- Climate threshold
- Climate vs weather
- Cloud
- Club good
- Coal
- Coal ash
- Coal bed methane
- Coal fired power plant
- Coal formation
- Coal liquefaction
- Coal reserve
- Coal seam
- Coal types
- Coase theorem
- Cobalt
- Coefficient of performance
- Cogeneration
- Collateral
- Collusion
- Combined cycle gas plant
- Commercial energy use
- Commodity
- Common resource
- Comparing gasoline, diesel, natural gas, and electricity prices
- Compressed air energy storage
- Compressed natural gas
- Concentration in parts per
- Conduction
- Conduction band
- Conductor
- Conductor resistance
- Connecting homes to the electrical grid
- Consensus about global warming
- Conservative force
- Control (building envelope)
- Control function
- Control rod
- Convection
- Conventional vs unconventional resource
- Convertible loan
- Copper
- Cost
- Cost-effectiveness analysis
- Cost benefit analysis
- Costs for a firm
- Coulomb
- Coulomb's law
- Crankshaft
- Crest
- Cross-sectional area
- Cross section of the Earth
- Crossflow turbine
- Crude oil
- Cryosphere
- Cubic feet
- Cubic meter
- Curie
- Currency
- Current
- Current transformer
- Curtain
- Curtain wall
- Cyclone separator
- DC generation
- Dam failures
- Daylighting
- Deadweight loss
- Decane
- Deforestation
- Demand
- Density
- Depreciation
- Detailed pollution data
- Deuterium
- Developed countries
- Developing countries
- Devonian
- Dielectric
- Diesel
- Diesel engine
- Diesel generator
- Diesel vs gasoline engine
- Diffusion
- Diode
- Diode operation
- Direct current
- Discount rate
- Discounting
- Discovery of the greenhouse effect
- Dispatchable source of electricity
- Distribution grid
- Distribution transformer
- District heating
- Domestic water heating
- Door
- Dopant
- Dosage
- Downstream oil and gas industry
- Drag
- Drake Landing solar project
- Drive shaft
- Drive train
- Driving forces for emission scenarios
- Drought
- Dry scrubber
- Dynamic tidal power
- Dyson sphere
- E-coating
- EV
- Earth
- Earth's energy budget
- Earth's energy flow
- Earth's heat balance
- Earth Temperature without GHGs
- Economic sector
- Economies of scale
- Ecosystem
- Efficiency
- El Nino Southern Oscillation
- Elastic potential energy
- Elasticity vs plasticity
- Electric charge
- Electric circuit
- Electric current
- Electric dipole
- Electric field
- Electric generator
- Electric meter
- Electric motor
- Electric power
- Electric power to the grid
- Electric switch
- Electric vehicle
- Electric vehicle emissions
- Electric vehicle practicality
- Electrical component
- Electrical conductance
- Electrical conductivity
- Electrical energy
- Electrical generation
- Electrical grid
- Electrical insulation
- Electrical insulator
- Electrical load
- Electrical outlet
- Electrical safety devices
- Electrical substation
- Electrical transmission
- Electricity
- Electricity as an energy currency
- Electrochemical cell
- Electrode
- Electrolyte
- Electromagnetic force
- Electromagnetic induction
- Electromotive force
- Electron
- Electron hole
- Electron volt
- Electrostatic precipitator
- Embodied energy
- Emission scenario
- Emissions
- Emissions trading
- End use energy
- Energy
- Energy conversion technology
- Energy currency
- Energy density