Trump win reaction, Space technology in farming, Briefing on Brexit

The President of the American farmers' union, Roger Johnson, on the impact that Donald Trump could have on agriculture once he takes up his post as US President.
We also hear from a professor of Environment policy, who outlines his concerns for UK trade deals with a more isolationist United States. Allan Buckwell says higher US trade tariffs could start a global trade war, putting British exports at risk.
And the technology that was developed for use on Mars, being used to help farming here on Earth.
Presented by Charlotte Smith and produced by Sally Challoner.