The present invention provides a method for recovering a natural gas contaminated with high levels of carbon dioxide. Particularly, the light emitting device comprises a threshold voltage compensator. The thermoplastic resin layer includes a thermoplastic resin and a polyester resin, and the polyester resin is contained in the thermoplastic resin layer in an amount of at least 20% by weight and no more than 90% by weight based on a total solid content of the thermoplastic resin layer. In the event bending, expansion andor contraction are applied to the sheath, the stress is inhibited from being transmitted to the optical fiber. In addition, the present invention is directed to a method for controlling pests by applying a pesticidally-effective amount of the above synergistic and residual pesticidal compositions to a locus where pest control is desired. The middleware then associates the user index identifiers with individual users and routes sent data to the individual users along the overlay tree.