Joe Romm from Climate Progress blog, reports: Decaying vegetation stuck under the ice or in peat bogs around the world, could start to heat up and tip world into a dangerous global warming - runaway episode.

The Planet Under Pressure conference began with an urgent warning of fast-approaching tipping points like the “compost bomb.” It ended with a plea by the conference leaders for urgent and large-scale action.

The film charts the growth of humanity into a global force on an equivalent scale to major geological processes.

The film was commissioned by the Planet Under Pressure conference, London 26-29 March, a major international conference focusing on solutions.