Dolphins are facing many threats by nature, but now they are facing many threats from humans. Pollution from pesticides are causing death in many areas of the world, along with garbage being dumped into the water causing them to entangle themselves, as seen in the picture above. Dolphins also face danger from fishing boats catching and killing them because of the style of fishing used.
To help, you could simply not litter, help clean beaches or shore areas, or donate to a cause that helps protect animals and removes polution.