You cannot dump your fluorescent lamps into the dumpster any more! The US EPA has made changes to waste rules applying to spent mercury-containing light bulbs that requires recycling of these lamps and prohibit landfill disposal.
The rule has been adopted to reduce the disposal of mercury containing wastes into landfills. Mercury is a toxic pollutant that accumulates in our body, especially for children who are at a high risk as they absorb more mercury as a percentage of their body weight. Examples of wastes that are being regulated under this new rule are fluorescent, high-intensity discharge, neon, mercury vapor, high pressure sodium, metal halide, thermostat (with metallic mercury in an ampoule), batteries (non-automotive), and lamp ballasts.