John Smeaton, SPUC national director, called him one of the world's greatest defenders of the sanctity of human life. He writes: "Cardinal López never failed to support the efforts of pro-life and pro-family movements around the world, continuing to publish authoritative documents and to bring together the world's foremost experts and activists working in the service of life and the family. In so doing, he introduced the leaders of the pro-life world to each other and helped to forge a genuinely worldwide pro-life movement.
"In 1994, when the United Nations threatened to reach an international agreement supporting the right to abortion, the cardinal sparked a storm of activity around the world which transformed the pro-life battle at an international level. As president of the Pontifical Council for the Family, his response to Pope John Paul II's urgent appeal concerning the dangerous situation at the United Nations, changed pro-life history.
"He and his indefatigable staff in Rome held international meetings of experts and activists, published authoritative works on key questions such as population trends and on Catholic church teaching on the transmission of human life in Humanae Vitae, and urged bishops worldwide to follow his fearless leadership.
"Cardinal López personally encouraged SPUC and hundreds of other delegates from pro-family and pro-life NGOs from around the world when they went to lobby at the United Nations Conference on Population and Development in Cairo. The pro-abortion lobby's objectives for the Cairo conference were defeated.
"His Truth and Meaning of Human Sexuality definitively
presents Catholic teaching on the anti-life, anti-family sex education which
tragically prevails in so many schools, sadly including Catholic schools,
throughout England and Wales. In the UK, Bishop Patrick O'Donoghue of Lancaster has picked up the cardinal's baton
in Fit For Mission: Schools?."
Cardinal López Trujillo visited the UK twice at SPUC's invitation - the second time in association with the Guild of Catholic Doctors to speak on sex education.