To raise money for the foundation, the Johnsons created the Kokua Festival in 2004.

CNN: Jack Johnson honors Earth Day with the gift of music

The Kokua Hawaii Foundation supports environmental education in schools and communities throughout Hawaii.

CNN: Jack Johnson honors Earth Day with the gift of music

The proceeds from both the festival and the album go back to Johnson's Kokua Hawaii Foundation to promote conservation efforts in Hawaii.

CNN: Jack Johnson honors Earth Day with the gift of music

More than 50 eco-friendly businesses and local environmental groups set up shop in the Kokua Village, which is much like what Johnson does on tour.

CNN: Jack Johnson honors Earth Day with the gift of music

"All of the musicians who've played at the Kokua Festival have a connection to the cause and the work we are doing with the foundation, " Johnson says.

CNN: Jack Johnson honors Earth Day with the gift of music