International Day for the Preservation of the Ozon Layer

In 1994, the United Nations proclaimed 16 September the International Day for the Preservation of the Ozone Layer, commemorating the date of the signing, in 1987, of the Montreal Protocol on Substances that Deplete the Ozone Layer. Ozone, what is it? Where does it come from? Why is the ozone…

ENVIRONMENTAL FRIENDLY CONDITIONAL CLAUSES EXERCISE!

(Beijing in the smog) If you want to practice the Conditionals and learn some facts about pollution do the following exercises. EXERCISES When gasoline is burnt to power cars and trucks, it [produce] carbon monoxide. Carbon monoxide is harmful when it [concentrate] in great amounts. If the air in a…