Oliver Geden, an energy and climate policy analyst from Germany, has given an interview “EU’s climate policy has lost its scientific basis”. He explains that the specific target that developed countries should aim for at least an 80% reduction in emissions by 2050, which was explicitly stated in IPCC AR4 (2007), is not present in AR5. This means that there is no longer any basis for EU emissions reduction
The relevant section of AR4 is this table on page 776, chapter 13.
(thanks to Oliver for pointing me to this – I had never been sure where these targets came from). In the latest IPCC WG3 report published in full yesterday, there is no such table with specific targets. The relevant chapter is again chapter 13, where there are only rather vague discussions of “Climate policy architectures” (Sec 13.4) and proposed policies in Sec 13.13.2.
From the UK perspective, this is very relevant for the UK Climate Change Act. The act was passed in 2008, a year after AR4, and proposes exactly the same target as in the above table, an 80% reduction from 1990 levels by 2050. Since there is no equivalent statement in AR5, it appears that the IPCC has undermined the basis for the Climate Change Act.