acti - afte
- actinic rays
- actinism
- actinometry
- actinomyces
- actinotoxemia
- action agenda
- action area
- action for an integrated approach to planning and management of land resources and to combat land degradation
- action level
- action on biological diversity
- action on energy
- action on freshwater resources
- action plan for biosphere reserves
- Action Plan for the Protection of the Atmosphere
- action spectrum
- action to combat land degradation, soil nutrients depletion and pollution of fresh water resources
- action-oriented proposal
- actionable fire
- activate
- activated alumina
- activated biofilter
- activated carbon
- activated carbon adsorption
- activated carbon filter
- activated carbon treatment
- activated carbon unit
- activated charcoal
- activated charcoal filter
- activated compost
- activated enzyme
- activated return sludge
- activated sewage
- activated silica
- activated sludge
- activated sludge age
- activated sludge clarifier
- activated sludge effluent
- activated sludge method
- activated sludge plant
- activated sludge process