Preservation of the environment, promotion of sustainable development and particular attention to climate change are matters of grave concern for the entire human family. No nation or business sector can ignore the ethical implications present in all economic and social development. With increasing clarity scientific research demonstrates that the impact of human actions in any one place or region can have worldwide effects.

In the desert we rediscover the value of what is essential for living; thus in today's world there are innumerable signs, often expressed implicitly or negatively, of the thirst for God, for the ultimate meaning of life. And in the desert people of faith are needed who, by the example of their own lives, point out the way to the Promised Land and keep hope alive.

I thank Missio, (Pontifical Mission Societies), the primary instruments for cooperation in the universal Church's universal mission in the world. Through their action, the proclamation of the Gospel bears witness to Christ and is lived out in service of our neighbour through justice for the poorest, education in isolated villages, medical care in remote areas, freedom from poverty, the reintegration of the marginalised, support for the development of peoples, the breaking down of ethnic divisions and respect for life in all its stages.

In Jesus Christ, God took on a human face and became our friend and brother.

Can we remain indifferent before the problems associated with such realities as climate change?

Material possessions, in themselves, are good. We would not survive for long without money, clothing and shelter. We must eat in order to stay alive. Yet if we are greedy, if we refuse to share what we have with the hungry and the poor, then we make our possessions into a false god. How many voices in our materialist society tell us that happiness is to be found by acquiring as many possessions and luxuries as we can! But this is to make possessions into a false god. Instead of bringing life, they bring death.

Believing is nothing other than, in the darkness of the world, touching the hand of God, and in this way, in silence, hearing the Word, seeing love.