The writer Tom Dyckhoff looks at the life and work of Richard Buckminster Fuller.
A profile of the new Secretary General of the United Nations, Ban Ki Moon.
Bridget Kendall travels to Canada to find out how weather affects a nation's character.
TV producer John Lloyd discusses the life of American architect Richard Buckminster Fuller
Clare Balding walks in search of the wild with environmentalist George Monbiot.
His Royal Highness The Prince of Wales discusses his musical choices with Michael Berkeley
Michael Berkeley's guest is primatologist Jane Goodall.
Helen Mark visits the Dartington Estate, Devon, where learning from nature changes lives.
The Pope visits a nation where one in four is a Catholic - America.
Ann Widdicombe MP nominates the late pontiff, who agreed with her on women priests.
Conservative MP Ann Widdicombe nominates the last Pope, John Paul II.
How Pope John Paul II's instillation caused excitement in America.
Pope John Paul II's joyous visit to the US, and Catholicism in America.
Pope John Paul II visits Poland.
Jonathan Maitland profiles Rajendra Pachauri, the head of the UN's climate change panel.
Tristram Hunt on how 18th-century thinker Robert Malthus's ideas wrought havoc in India.
HRH The Prince of Wales shares his passion for the rich biodiversity of Transylvania.
HRH the Prince of Wales shares his hopes and fears for the future of farming communities.
Did EF Schumacher's landmark book Small is Beautiful inspire David Cameron's big idea?
Extracts from letters charting a friendship between Pope John Paul II and a married woman.
Elinor Goodman asks if Prince Charles's campaigning will bring a new style of monarchy.
Writer and political activist George Monbiot chooses 18th-century revolutionary Tom Paine.