From our free online course, “Energy Within Environmental Constraints”:
https://www.edx.org/course/energy-within-environmental-constraints?utm_source=social&utm_medium=partner-marketing&utm_content=youtube-harvardx&utm_campaign=harvardx
This is the fourth of a four-part series covering all the major components of air pollution. Here, Harvard Professor David Keith explains particulate matter, which shortens lifespan substantially.
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