Wetlands face destruction due to threats such as commercial development, industry, urbanization, agriculture, invasive species, pollution, climate change and dams. It is estimated that approximately half of the world's wetlands have disappeared since 1900. The loss or alteration of wetlands is believed to contribute to global warming.Know More
Wetlands are a type of ecosystem characterized by either a seasonal or permanent saturation of land by water, which can either be fresh, brackish or salt. Aquatic plants and other vegetation specific to wetlands are another defining characteristic, as they are fully adapted to the exclusive hydric soil. Wetlands are useful to the environment due to their ability to purify water, provide stability to shorelines, serve as a home for a variety species and act as a buffer for floods. Examples of wetlands include swamps, bogs, marshes and fens. Climate varies based on location, but wetlands are present on every continent with the exception of Antarctica. Of all ecosystems, it is believed that wetlands face the most environmental degradation.
Around half of the world's human population relies on wetlands for their freshwater needs. Wetlands also serve as a significant source of protein and are often used as fisheries. Conservation efforts within the United States are centered around building artificial wetlands to offset the loss of those from industry and commercial interests.Learn more about Human Impact
Littering has a negative impact on wildlife because it lures animals out of their natural habitats and onto dangerous roads or highways where they have an increased chance of being killed. Small rodents and other prey find their way into these dangerous areas to feed on food and other litter thrown away by people, which then attracts other predators, such as bears, foxes, armadillos, eagles and coyotes.Full Answer >
A positive human impact on the environment occurs when a person takes action to improve society, nature and its resources. Acting positively, even in a small manner, has a major impact on the environment, especially when it is done consistently.Full Answer >
Tourism contributes both positively and negatively to the environment, and conservationists are still trying to figure its net effect on the environment. Negative effects of tourism include increased pollution, an increased carbon footprint and the stress placed on the native plants, animals and ecosystems. Positive benefits of tourism include increased awareness of the plight of many species and increase in capital that flows into conservation organizations.Full Answer >
According to cultural anthropologist David F. Aberle, the four types of social change include alternative, redemptive, reformative and revolutionary. These different movements are distinguished by how much change they advocate and whether they target individuals or the entirety of a society.Full Answer >