Yes we are! Studies shows that shark populations are declining all over the world due to 3 main factors, all caused by humans:

All of these activities are worse than we think! Sharks are very sensitive species that cannot replace dead individuals quickly. This is because they have such long gestation periods, they produce few offspring per year, and they take a long time to reach maturity. In addition, sharks segregate according to age and sex, so entire generations or populations of males or females might die from overfishing before they ever reproduce.