Meanwhile it’s not only the question about how to get information about living sustainably and how to actively engage - there is a lot a lot a lot of information and organizations out there. So it’s as well about finding the most accessible and comprehensible stuff…
I came across a beautiful website, a project of the Earth Island Institut, and on it I found a very valuable source of information, for free:
The Sustainable World SourceBook
The SourceBook is a concise (58 pages), attractive and user-friendly personal manual for contributing to a sustainable world. It contains essential information on the state of the planet and recommended solutions, effective actions for greening your life, and a resource directory of useful organizations, books, films and websites.
check it out! read it :-)