Fighting alien species in Florida and London, plus Hong Kong's tradition of shark fin soup
BBC World Service
Can the Christian churches help the Roma overcome unemployment and poverty?
2/2 Why racial tensions are increasing in Sweden
2/3 Gabrielle Walker explores how our atmosphere both protects and destroys us
Roland Buerk looks at Japan's growing 'rent a friend' industry
Joanna Smith Rakoff explores JD Salinger's relationship with fans who wrote him letters
BBC Radio 4
Why is there a crisis in India's microcredit industry? Assignment investigates
39/40 We search for stoats and weasels, once abundant and now little-seen.
1/3 Rory Cellan-Jones traces the roots of social networking in the 70s and 80s.
How will the mortgage freeze hit Britain's already battered economy?