填空题

A-- global warming B -- air pollution
C -- littering D -- illegal hunting
E -- greenhouse effect F -- the polar icecaps melt
G -- acid rain H -- forest coverage
I -- sandstorm/dust storm J -- over-fishing
K -- destruction of natural habitats L- desertification
M -- to dump poisonous/harmful substances
N -- solar energy O -- renewable sources
P -- tropical rainforest Q -- bio-diversity
R -- economic growth and environmental conservation
S -- severe climate change T -- waste-water treatment plant
( ) 温室效应 ( ) 酸雨