http://upload.wikimedia.org/wikipedia/commons/e/e1/LondonSmog.jpg
100 years ago, London's air was dark and dirty. This was called london smog. Factories burned coal, and houses were heated with coal, filling the air with soot. This makes it hard to breathe and fills the air with smog. The simplest way to prevent this is to burn less coal.
1 comment:
need to put more words in there. But nice job I think it was hard to breath in. It is amazing how much they burnd coal.
well see yeah aruond school,
tyler
[$shizl$]
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