Why Do We Have Different Nose Shapes? "Why do we have different shapes of noses? Why are some noses flat while others are long?" There are a few reasons why humans have different shapes of noses, such as some being flat while others have long noses. The main reason behind these variations is climate. In warmer climates, people tend to have wider noses. This is because wider noses help to cool the air before it reaches the lungs. The increased width of the nostrils allows for greater airflow, fac