What are wetlands and why are they important? Scientists agree that wetlands are areas that either temporarily or permanently hold water.The amount of water in a wetland, along with the types of soil, plants and animals that live in it are used to identify which type of wetland it is. This is where the scientists don't agree. How much water makes it a swamp? If there are carnivorous plants, is it a marsh or a bog? This informative talk includes how to identify your favorite wetland and why these ecosystems are vital to the world's environment.