Jack Johnson's Kokua Festival concert — happening today and tomorrow at Waikíkí Shell — benefits Johnson's nonprofit Kokua Hawai'i Foundation, which supports environmental education in schools and communities in the state. Artists include multi-Grammy-winning reggae musician Ziggy Marley; blues/world music legend Taj Mahal, who lived for years in the Islands; 'ukulele virtuoso Jake Shimabukuro, who's wrapping up a European tour; and Maui singer-songwriter Anuhea, who credits Johnson as her musical inspiration. Great concert supporting a great cause! Photo - Bielmann