The Green Africa Directory is the go-to source to get recent updates on what's going on on the continent when it comes to sustainable change. They offer a variety of ways to get involved. As is obvious by the name, they have listings of environmental businesses divided through industry such as cosmetics as well as places (mostly countries but also a few hub-central cities as well).
At the same time, however, the Green Africa Directory also offers job and volunteer opportunities, relevant events to attend, courses to take, contests to apply for and continent-wide awards. If your interest is eco Africa, whatever your need, this is a good place to start.
Green Africa Directory website
Green Africa on Facebook
Green Africa on Twitter
Eco Continent Publications
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Adventures with Purpose
Sustainable Development Business Groups
Empowering Organic T-Shirts
Ecotourism Development Cooperatives