Pollution is caused by human actions, either consciously, negligently, or through ignorance, and contaminates the environment. Chemical wastes pollute water sources, which are essential for life. The document discusses how pollution causes health problems and harms the planet. It recommends reducing pollution through using cars less, taking public transportation or biking, and using recycled materials. The conclusion emphasizes that if humans do not care for the planet, they will not be able to live on it, so it is important to be more ecological.