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.

Ancient stone bridges with water pouring over the parapets, their narrow arches choked by fallen trees and debris washed down swollen rivers, have been recurring images in reporting the myriad floods of the past sodden years – and the bridges have often been blamed for damming the rivers' flow and causing misery to nearby communities.

As torrential rains wash away the snows, causing more floods in many parts of the country, English Heritage is launching a pilot study to establish whether the 7,000 listed bridges in its care are the villains or the victims of flooding.

The Green Deal needs to involve more small, local builders to work, as red-tape and negative publicity threaten to scupper the Government’s flagship energy-efficiency policy before it gets off the ground, says the Federation of Master Builders (FMB).

Just over a quarter (27%) of small to medium-sized (SME) construction firms are planning to get involved in the Green Deal according to a  recent survey by the FMB, but many said the application and accreditation process was overly complicated, while householders were unaware of the potential benefits because of a lack of positive publicity about the scheme.

Scientists have identified willow trees that yield five times as much sugar as ordinary varieties, "drastically reducing" the impact of biofuels.

UK researchers found that if the trees grew at an angle, they produced a special kind of wood that resulted in the higher sugar content.

Willow, a short rotation coppice crop, is widely grown as a source for the biofuel and biomass industries.

The findings appear in the Biotechnology for Biofuels journal.

Solar companies are planning to sue the government for £140m in damages, because of the cuts to subsidies in 2011 that were subsequently ruled "legally flawed" in the high court.

The 17 companies said the way in which the changes to the feed-in tariff were handled was disastrous for their businesses, because it led to a sudden and dramatic fall in the number of people installing solar panels, and companies had to lay off thousands of workers.