Biogas - a methane-rich fuel made from rotting food waste or sewage - has huge potential as a clean, green fuel for the UK. But a perverse web of subsidies, rules and contracts could mean UK councils are about to kiss goodbye to the real power of waste...
In the cut-throat world of clean energy investment, is it more important that things are done for the right reason, or that the right thing gets done? We may not like the answer...
With surging demand for power and blackouts common across the continent, Africa is looking to solar, wind and geothermal technologies to meet its energy needs
In the second part of a special programme looking at the significance of the Arctic in the context of climate change, Phil England hears about the rush to exploit the region's oil and gas supplies...