Can world leaders get their act together on climate change? That's the big question at the global climate summit, which starts today in Paris. We'll have a preview. Also, the summit is taking place amid heightened security in the aftermath of the Paris terrorist attacks. There's also been a lot of discussion here in the US about what constitutes terrorism, after the term was widely used to describe the shooting at a Planned Parenthood clinic in Colorado last Friday. Marco discusses what is terrorism, and what isn't, with anti-terrorism expert Juliette Kayyem. Plus, an Italian sports reporter gives us his take on Kobe Bryant's announced retirement. The NBA star grew up partly in Italy and has a huge following there.