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信息发布者：
coral reefs
polar bears and penguins
lie between deserts and forests
the difference in temperature between day and night
include all living and non-living things
small ponds
the awful climate
keep the balance between A and B
a very large ecosystem on Earth
cover about 71% of the Earth's surface
have a role to play
hold plenty of salt water
return to the ocean
go on and on
the "heart" of the Earth
help get rid of pollution
prevent floods
produce oxygen
store water like a giant sponges
act like the “kidneys” of the earth
cover nearly a third of the earth's land area
take in carbon dioxide from the air
trap harmful things in their leaves
support millions of plants and animals
slow down climate change
millions of tons of plastic
harm the balance of the ocean ecosystem
build a better home for local wildlife
the topic of this class
quite a few desert plants
warm, bright and noisy
cause coral to die slowly
the largest coral reef system on Earth
greatly damage the ocean's environment
one of the world's most important wetlands
provide food and cover for a lot of wildlife
in the north-east of China
some rare birds
for a short stay
in the daytime
in order to have more space for farms and buildings
lead to less space for wildlife.
reduce the number of tourists visiting wetlands
create Yancheng Nature Reserve
make/create laws
keep the ecosystem balanced
destroy the ecosystem in forests
You said it!
education and knowledge
wastewater from factories and houses
environmentally friendly products
clean up the beach
provide us with food
kill sea life
solve the problems
join an environmental group
set up
keep wetlands free from pollution
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