Air pollution – contaminants or substances in the air that interfere with human health or produce other harmful environmental effects.
Alternative energy – usually environmentally friendly, this is energy from uncommon sources such as wind power or solar energy, not fossil fuels.
Alternative fuels – similar to above. Not petrol or diesel but different transportation fuels like natural gas, methanol, bio fuels and electricity.
Antimicrobial Preservative- A natural or synthetically derived chemical additive incorporated into or onto product surfaces to prevent microbial growth, odors and stains.