So, imagine a big ship like a giant bathtub on the water. These ships have things called engines that make them go. But, when these engines work, they make something called pollution. This pollution is like really bad smoke that goes up in the air and can make people and animals sick.
But wait, there's more. These ships need oil and gas to run their engines. Sometimes, these ships can spill some of this oil and gas into the water. This makes the water dirty and can harm fish and other animals that live in the water.
So, we need to make sure that these ships don't make too much pollution and don't spill oil and gas into the water. We want to keep the air and water clean and healthy for everyone and all the creatures that live on Earth.