Tom Heap investigates whether we're running out of phosphorus, an element vital for life.
BBC Radio 4
7/7 Matthew Hill is on the trail of possibly the world's most elusive creature, Bigfoot.
After 8 years as NFU president, Peter Kendall steps down. We ask about his future plans.
5/6 Clare Balding revisits Tennyson Down on the Isle of Wight to meet Elizabeth Hutchings.
Julian Rush asks what is being done to protect UK forests from diseases like ash dieback.
6/7 Howard Stableford finds out how the midland brown snake is getting help to cross the road.
Caz Graham visits the Yorkshire's 'rhubarb triangle', to find out about an unusual crop.
4/6 Clare Balding walks with a mental health walking group in Shrewsbury.
Nuclear power is back on the UK's agenda, but radioactive waste remains the problem.
5/7 Professional tree climber James Aldred visits Morocco to climb a giant Atlas cedar tree.