Man-made sources refer to materials or energy produced by human activities rather than occurring naturally. These sources can include a variety of items such as plastic, concrete, and metals, which are created through industrial processes. Additionally, man-made sources encompass energy production methods like fossil fuels, nuclear power, and renewable energy systems, which are designed to meet human needs. These sources can have significant impacts on the environment and human health. For example, the use of fossil fuels contributes to air pollution and climate change, while the production of plastic can lead to waste accumulation in oceans. Understanding man-made sources is essential for developing sustainable practices and reducing negative effects on the planet.