According to the testing by UL, the charger for the Samsung Galaxy S4 eats a very small amount of energy while on standby. Additionally, the box will be made of 100% recycled materials while the ink used on the manuals and guides is soy ink. The Samsung Galaxy S III and Samsung GALAXY Note II both were previously awarded certification from UL's environmental arm.
2.2 These requirements apply to products that are or will be available for purchase at the time of certification.
2.3 The criteria in these requirements were developed based on the life cycle stages of mobile phones and similar electronics. Sustainability factors considered in these requirements are: materials, packaging, manufacturing and operations, energy efficiency of the external power supply, health and environment, and end of life management. Credit for innovations in these, or other factors not listed, is also addressed in these requirements.
source: UL via SammyHub