Help! Glass in my backyard

I recently had a renovation done on my Carroll Gardens brownstone and the contractors used the backyard for debris storage. Now that the debris has been removed, we are left with a yard full of glass and a dog who longs to chase balls back there. As much as we rake the backyard, glass seems to be everywhere and I don’t know what to do. Has anyone had a similar experience? Any advice for getting rid of the glass?

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