Nature and environment

 the accumulation of plastic objects in the environment

a problem of harmful gases in the air

a problem when bad chemicals pollute rivers, lakes, seas and oceans

a problem when too many people live on Earth

safe

dangerous

in danger

endangered 

becoming smaller

growing

becaming

won’t take; will become

will take; won’t become

don’t take; will become 

colder

warmer

cleaner

Rubbish

Fog

Rubber

a) trash, smoke

b) noise, clear water

a) True

b) False

a) True

b) False

wiser

melting

colder