Who now speaks of the fires in Australia, or remembers that 18 months ago a boat could cross the North Pole because the glaciers had all melted? Who speaks now of the floods? I don't know if these are the revenge of nature, but they are certainly nature's responses. Today I believe we have to slow down our rate of production and consumption and to learn to understand and contemplate the natural world. We need to reconnect with our real surroundings.

Let us sing as we go. May our struggles and our concern for this planet never take away the joy of our hope.

It is a source of great pride to me that the leading role my husband played in encouraging people to protect our fragile planet, lives on through the work of our eldest son Charles and his eldest son William. I could not be more proud of them.

When it comes to the care of our common home, we are living at a critical moment of history.

We must not place the burden on the next generations to take on the problems caused by the previous ones. Instead, we should give them the opportunity to remember our generation as the one that renewed and acted on - with honest, responsible and courageous awareness - the fundamental need to collaborate in order to preserve and cultivate our common home. May we offer the next generation concrete reasons to hope and work for a good and dignified future!

Mr. President [Obama], I find it encouraging that you are proposing an initiative for reducing air pollution. Accepting the urgency, it seems clear to me also that climate change is a problem which can no longer be left to a future generation.