<p>We start with the street artist Banksy, and his 2015 dystopian 'bemusement park'.</p><p>Then, we talk to roller coaster enthusiast Megan MacCausland, from the European Coaster Club. </p><p>Plus, we go back through the BBC archives to tell the story of the coelacanth, a fish believed to have been extinct for 65 million years. </p><p>Next, South Africa's Truth and Reconciliation Commission, set up after the abolishment of apartheid in the 1990s. This programme contains contains harrowing testimony and graphic descriptions of human rights violations throughout.</p><p>Also, the six-day IRA siege on London's Balcombe Street in 1975, where a couple were taken hostage.</p><p>Finally, it's been 10 years since 193 countries and the European Union adopted the Paris climate agreement, in December 2015. </p><p>Our Sporting Witness programme this week looks at how an international skiing scene developed in the mountains of Bamiyan province, Afghanistan, in 2011. </p><p>Contributors: </p><p>Kurtis Young - steward at Dismaland. Megan MacCausland - European Coaster Club. Marjorie Courtenay-Latimer - South African museum curator (from archive). Sisi Khampepe - served on the Amnesty Committee. Steven Moysey - saw the Balcombe Street siege unfold. Christiana Figueres - head of climate negotiations at 2015 United Nations Climate Change Conference in Paris. Alishah Farhang - Afghanistan skier. </p><p>(Photo: Dismaland in Weston Super-Mare. Credit: Kristian Buus/Getty Images)</p>