Karen Mok

The old Legco building before Earth Hour. Photo: Felix Wong

Letters to the Editor, March 3, 2013

I was interested to read Dr Robert Hanson's letter ("'Green' light bulbs really a health hazard", February 22), replying to my letter ("Offer rewards for light-bulb recycling", February 17). However, I would like some references to back up the claims he made.

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