Dvorak is also chairman of Fifa's Medical Assessment and Research Centre.

BBC: Fifa medical chief 'satisfied'

Rob Gross from Imperial College London, head of policy and technology assessment at the UK Energy Research Centre (UKERC), believes Inenco is presenting a worst-case scenario.

BBC: RELATED BBC SITES

The German Research Centre for Geosciences is in the midst of a more detailed assessment, backed by oil firms.

ECONOMIST: The hunt for shale gas in Europe

British Airways also created an online jet lag fighting calculator, where the advice is based on research by Chris Idzikowski, director of the sleep assessment and advisory service at Edinburgh Sleep Centre.

BBC: Online calculators combat jet lag