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ECHO is enhanced periodically with minor improvements that may not be illustrated in the videos. In summer 2018, ECHO's home page was redesigned to simplify and improve access to many features. Read the ECHO Quick Start Guide for information about features that are directly accessible from the home page. Also, styling updates of some ECHO tools provide a more consistent experience across EPA and other government digital services. Beyond the home page, the content and features of ECHO remain the same and style differences do not affect the instructions in the tutorials.