Various environmental and energy research centers have generated very different analyses of the economics and efficiency of renewable energy, yielding divergent conclusions on whether or when renewables will be able to overtake fossil fuels. The UK-based Environment and Climate Intelligence Unit has long criticized the International Energy Agency for their pessimistic take on renewables, arguing that this creates a false representation of the energy market that might detract from investment in renewable energy. The latest reports of the US Federal Energy Regulatory Commission, however, predict the transition from fossil fuels to renewable energy to take place at a much faster rate than was previously expected. Even the IEA have come around to appreciate the unexpected rate at which wind and solar energy are being adopted all around the world.
The explanations given for this uptake are largely economic, rather than environmental. Spreading the "good news" that renewables are both more environmentally sustainable and economically viable energy resources has become the rallying cry of many organizations seeking to convince government and industry to shift development strategies and investments from fossil fuels to renewable energy.