Today, grandpa took me and my sister out in a car. On the way, I found a big chimney, from which came out bursts of white smoke. I asked my sister, "are those chimneys making clouds?" My sister chuckled and said, "those white smoke are the white smoke that pollutes the air, not the clouds." I looked at my sister in surprise and couldn't say a word.
How many things pollute the air in the world! We should eat less barbecue, build less factories, discharge less waste water and cut less trees. Let's make friends with nature! Let's protect nature and make it more beautiful!