ISO 14001 is international standard which defined criteria concerning Environment Management System, EMS and the same group with ISO 14000 and ISO 14004.
ISO 14001:2015 is the last version of ISO 14001 which will help you for implementing, improving and productivity in environment administration and management.
ISO 14001:2015 consist of 10 contents similarly ISO 9001:2015, but ISO 14001:2015 express environment administration and management.