From 2000 through 2013, at least 10 protests have drawn more than 10,000 people.
Research by the Chinese Academy of Social Sciences shows the most common triggers are land grabs by local officials, labor issues, pollution, and ethnic tensions. Underpaid teachers, Nimby homeowners, and coal miners have all taken to the streets at one point or another.
via Hong Kong Isn't the Only Protest Chinese Leaders Are Worried About – Businessweek.
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