After starting with a schedule of a mere two hours per-night, television became more widespread in Germany in the 1960s. Color broadcasts were introduced in 1967. Without competition from private broadcasters (other than the francophone Europe 1 and the multilingual RTL (Radio-Television Luxembourg) radio programs), the ARD stations made considerable progress in becoming modern and respected broadcasters. ZDF (Zweites Deutsches Fernsehen, Second German Television), a second public television broadcaster with centralized national organization structure, began its programming in 1963, but ARD would encounter no private competition in Germany until 1984. The ARD stations have also been a significant force in German politics; such investigative news magazines as "Monitor" and "Panorama" still reach millions of viewers every week. The environmental movement increased in popularity during the 1980s largely as a result of the disclosures made by ARD.