Why another document on the Eucharist?

"Pope Benedict XVI is eager for a document on the Eucharist" is the title of this article by Zenit News. Why? Pope John Paul II gave us the Encyclical on the Eucharist, Ecclesia de Eucharistia and many apostolic letters and the many writings of saints and doctors of the Church explain the meaning of the Eucharist for our Catholic spirituality. Why is another document necessary?

The attached article gives the following quote from the Holy Father:
The Holy Father continued: "At a time characterized by the growing phenomenon of globalization, it is increasingly necessary to have the truth of Christ and of his Gospel of salvation reach all with vigor and clarity."

http://www.zenit.org/english/visualizza.phtml?sid=90203

The world is not believing in the Real Presence, many Catholics don't believe, so we must continue to be bold in proclaiming that God is present in His Kingdom, now on earth, via the Body and Blood of his Son in the consecrated Bread and Wine. As member of His Body, we must assist with the evangelization of the Good News. Visit the following site to purchase materials that you can distribute to educate people and yourself on the Real Persence:
http://www.fathersofmercy.com/our_apostolates/mission_tapes/topic/holy_eucharist

Peace in Christ.