Making money from old phones, engines and plastic bottles is the topic for Evan Davis and guests. How do you ensure that you collect what others throw away? How much profit is there really to be had from creating new from old? And why aren't milk bottle tops quite the colour they once were? Guests Charlo Carabott, co-founder & CEO Mazuma Mobile Matt Bulley, managing director Caterpillar Reman Europe Chris Dow, Founder & CEO Closed Loop Recycling Producer : Rosamund Jones.