Pollution and contamination - AIRC255

Do you know the meaning of sludge and smog? Is there a difference between contamination and pollution? What does it mean if something is biodegradable? Learn about pollution and how it affects the environment in this episode. Las notas del episodio y más podcasts para mejorar tu ingles están en: http://www.inglespodcast.com/  Shownotes and more podcasts to improve your English at: http://www.inglespodcast.com/