The 25th UN climate change conference begins this week in Madrid. It's known as COP25 or the Conference of the Parties. The agreement, signed in 2015, set out a plan to limit global warming to well below 2 degrees Celsius above pre-industrial levels and pursue efforts to limit it to 1.5 degrees.

RAZOR has already looked at several CO2 stories, learning that a great project is never one person's idea – it's always a collaboration – based on the enthusiasm, energy and hope of a community. 

In this episode we revisit some of these projects; Emma Keeling meets the Captain of a vessel on a six-year mission around the world using solar power, wind, batteries and hydrogen, in an effort to prove there is a greener way to travel. In Iceland, scientists are developing a carbon capture technology that could allow greenhouse gases to be removed from the atmosphere and fixed into rock on the sea bed. Guy Henderson explores the future of wind power - Vortex Bladeless is developing ground-breaking technology that uses a vibration resonant cylinder which oscillates in the wind, generating power through the use of a dynamo.