endangered species
加入词篮jeopardize
rare
rarity
energy
solar energy
nuclear energy
power
solar power
contaminate
contamination
contaminant
taint
tainted
sewage
sewerage
sewage plant
sewage farm
drainage
purify
purification
purity
impurity
purely
pure
sheer
environment
environmental
environmentally
environmentalist
environmentalism
preserve
preserver
preservation
preservationist
conserve
conservation
conservationist
conservation area
protect
protection
protective
protectively
protectiveness
extinction
extinct
ecocide
die out
wildlife
wild-life
pollute
pollutant
polluter
pollution
resource
deplete
depletion
run out
use up
renewable
non-renewable
renew
renewal
renewed
anew
recycle
recyclable
recycling
reproducible
reproduce
aggravate
aggravating
aggravation
deteriorate
deterioration
acute
degenerate
degeneration
degradation
exacerbate
exacerbation
sustainable
unsustainable
sustainability
sustain
afforestation
afforest
deforestation
deforest
reforestation
erode
erosion
soil erosion
denude
denudation
greenhouse
the greenhouse effect
greenhouse gas
global warming
ozone
