Fill in: fossil, energy. ozone, pesticides,
extinction.
1 We must act to solve the ..................... crisis
before there are no gas and oil resources left.
2 Rivers can become contaminated when
farmers use. ................ on their crops.
3 Some scientists predict that our supplies of
........... fuels could run out within fifty years.
4 Conservation of the jungle will help to
prevent further animal
5 The ..................... layer protects us from the
most harmful radiation from the sun.
..
