The positive and negative effects of the bikes in the environment

Bikes are very popular and efficent transport and  we can do exercise with it. I'm going to talk about the advantages and the disadvantages of the bike.

In general , the bikes are the best transport because they don't pollute the environment and you can have fun while you are riding it through the prominade. Another positive thing of the  bike is that you don't have to pay for petrol , so it's cheaper.

On the other hand , the disadvantages of the bike are: They are more dangerous than cars and they are expensive.

To sum up , the bikes are the best way not to pollute the environment , but you need to have caution.