The Intergovernmental Panel on Climate Change (IPCC) Working Group III Fifth Assessment Report was released on 13 April 2014. The report evaluates 900 mitigation scenarios and concludes that large-scale changes in energy systems are essential to restrain global warming to 2 degrees and avoid the harshest impacts of climate change. The report examines cost-effective measures to ‘decarbonise’ the economy, recommending 80% of all electricity be generated from renewable sources by 2050 and advocating a range of bioenergy, carbon capture and storage, afforestation and land use planning approaches to mitigate emissions.
The IPCC emphasised that tough action is required immediately, but conclude that well-implemented actions will be affordable and effective.
You can read the full report, or the summary for policy makers, on the IPCC website.