BBC: A UN report on climate change is expected to call for a trebling of the planet's use of renewable energy sources such as solar and wind power.
The report is also expected to argue that the trend of increased carbon emissions can only be reversed if a "massive shift" in energy use is made.
Scientists will also cautiously endorse a shift to natural gas an alternative to carbon intensive sources.
The report will be released on Sunday at a press conference in Berlin.
It will argue that if...