acid rain
afforestation
biodegradable
biodiversity
biological control
biomass
biome
biosphere, the
canopy
carbon emissions
catalytic converter
CFC
climate change
conservation
conservationist
cull
deforestation
degradation
desertification
ecological
ecology
ecosystem
ecotourism
effluent
endangered species
environment
environmental
environmentalist
environmentally friendly
food chain
food web
forest
forested
forestry
fossil fuel
green
greenhouse effect, the
greenhouse gas
groyne
habitat
hazardous waste
landfill site
leaded
logging
national park
natural disaster
nature reserve
noise pollution
non-biodegradable
non-renewable
oil slick
organic
overgrazing
ozone hole
ozone layer
park
pesticide
planet
pollutant
pollute
pollution
preservation
preserve
protected
rainforest
reclaim
recycle
reforestation
renewable
reserve
reuse
runoff
sanctuary
sewage
sludge
soil erosion
solar energy
sustainable
sustainable development
urbanization