Complete the sentences with the correct answer, A, B or C.
21 Today, children learn more about the dangers to the ……………………… than in the past.
A ozone layer B environment C pollution
22 Scientists say we’re destroying the ………………………
and this creates global warming.
A greenhouse B ozone layer C agriculture
23 Many sea birds died because of a huge ……………………… in the Atlantic last year.
A oil spill B drought C flood
24 Hotter summers with no rain will mean that there are more ……………………… in some countries.
A droughts B waste C nuclear disasters