As the price of oil increases again, Canada's tar sands once more look like a giant cash cow to the industry. Now, the only thing standing between the 400 ton bulldozers and rampant environmental destruction may be a small group of First Nations people...
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...