A worldwide expansion of relatively cheap shale oil could put investment in renewable energy and global emissions targets under threat, as well as posing other environmental risks.

The shale oil industry is still in its infancy, but has the potential to reach up to 12 per cent of global production, potentially pushing down oil prices by as much as $50 per barrel by 2035, according to a new report by consultancy firm PwC.

Ethiopia, like its fellow Great Rift Valley countries, has enormous geothermal energy potential. However, the costs involved and the need for skilled expertise have, until now, been major obstacles.

In late January, the Development Bank of Ethiopia announced that, over the next five months, it will offer an initial $20m to kickstart geothermal energy projects in the country's private sector as part of a programme funded by the World Bank. A further $20m is expected to be made available at a later stage.

A solar power company capable of "printing" colourful glass that can generate electricity from the sun's energy announced a £2m funding boost on Tuesday.

Oxford Photovoltaics, a spin-off from the University of Oxford, said the investment from clean-tech investors MTI Partners will help its solar glass, which can be dyed almost any colour, take a step closer to the commercial market.

Alex Salmond could be forced to abandon his ambitious 100% green energy target if Scotland votes for independence, a team of academics has warned. The group of energy specialists from four universities across the UK argues that an independent Scotland would have to fund far more of the billions needed to subsidise renewable energy such as offshore windfarms and wave and tidal devices on its own, because it would lose significant financial support from consumers across the UK.