 DENVER, Colorado--BUSINESS WIRE--Liberty Global Nasdaq: LBTYA, LBTYB and LBTYK, one of the worlds leading converged video, broadband and communications companies, has been recognized once again for its commitment to sustainability and corporate responsibility by its inclusion in the prestigious Dow Jones Sustainability World Index for the eighth year, as well as its ninth consecutive year in the North America Index. Liberty Globals Belgian subsidiary Telenet also appears in the Index and 