unit 1
part a new estimates of oil and gas resources in alaska
part b “black holes” aren't holes at all
unit 2
part a poplar trees help clean up the environment
part b trees could affect land use， reduce skin cancer
unit 3
part a the impacts of composting
part b converting wet bio-waste into energy： alternative to land application?
unit 4
part a acid rain：what's the solution
part b tropical rivers exhale millions of tons more co2 than thought
unit 5
part a bioremediation-using the trophic diversity of bacteria to solve environmental problems
part b cancer and the environment
unit 6
part a obsolete pesticides threaten environment
part b golf is an environmental hazard
unit 7
part a garbage-potential resources
part b imagine no restrictions on fossil-fuel usage and no global warming！
unit 8
part a abundant resources for making foods
part b pollution-related diseases kill millions of children a year
unit 9
part a what's wrong with our weather
part b new research could spearhead permanent nuclear waste storage
unit 10
part a the oceans man's last great resource
part b everybody's problem hazard waste
unit 11
part a new technology of air pollution control
part b garbage in， garbage out
unit 12
part a water problems
part b diesel particles in air slow kids'lung development
unit 13
part a basic factors in water analysis
part b thunderstorms are affected by pollution
unit 14
part a solid waste disposal
part b the time is now
unit 15
part a biological treatment system
part b the invisible world of industrial gas
unit 16
part a health effects of noise
part b war affects the environment
unit 17
part a water purification
part b summary of eia
unit 18
part a water treatment processes
part b thermal pollution
afterclass readings
ⅰ microbial ecology
ⅱ fungus
ⅲ is all environment about wildlife?
ⅳ biological control： bacillus popilliae
参考译文
keys to exercises
词汇表
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