Complete the sentences with the words in the list.
(climate change | flooding | fumes litter pollution | smog )
1 .With the Earth's temperature rising each year, many scientists now believe____ is the biggest threat to our planet.
2.____ from factories and cars are creating huge problems and many of the world's largest cities are permanently covered by thick
3 There has been serious____ across the area and many people have had to leave their homes.
4. I get so angry when I see people dropping____ in the streets. Why can't they use the bins?​