In my opinion, you are absolutely correct in calling out the IPC for lowering grey literature standards rather than raising them.

FORBES: The Self Corruption of Climate Science

The information pool consists of monographs, series, journals, grey literature and databases.

UNESCO: Centro de Recursos Documentales e Informaticos (CREDI)

Still, most would not see the Gray Lady as grey literature.

ECONOMIST: Rajendra Pachauri and the IPCC

The TG concluded that the IPCC should not follow (or, enforce) the procedures for evaluating grey literature that had been on the books as official IPCC policy for more than a decade.

FORBES: The Self Corruption of Climate Science

To accept a role for grey literature at the IPCC, provided it is properly and critically assessed by the authors, is not to say that peer-reviewed publications should not dominate the assessments.

ECONOMIST: Rajendra Pachauri and the IPCC

The mishandling of grey literature has resulted in many of the errors discovered in the most recent Assessment Report, which summarizes the state of climate change science for policymakers and political learders at every level of government.

FORBES: The Self Corruption of Climate Science

The Fifty Shades trilogy is about a steamy romance between entrepreneur Christian Grey and literature student Anastasia Steele.

BBC: Sales of printed books slump in 2012

In its 120 pages, Weathering Uncertainty references 280 publications from the scientific literature (peer-reviewed and grey) and covers themes at the core of the Fifth AR such as foundations for decision-making on indigenous knowledge, traditional livelihoods, vulnerability, resilience, and adaptation policy and planning.

UNESCO: Communication and Information

Dr de Grey's ideas, which are informed by literature surveys rather than experimental work, have been greeted with scorn by those working at developing such repair kits.

ECONOMIST: The latest from the wacky world of anti-senescence therapy