Yesterday 10 Nobel Peace Laureates sent a letter to President Obama and Secretary of State Kerry urging them to reject the proposed Keystone XL pipeline. The Sierra Club and the NRDC organized the letter in hopes they could parlay the Nobel’s credibility to generate support for their minority opposition to the project.

But Big Green should have checked their list of spokespeople before hitting send on the press release. Setting aside the questionable relevance of a Nobel Peace prize to the pipeline debate, several of the letter’s signatories have checkered histories that suggest they’re not reliable sources:

Adolfo Pérez Esquivel (Nobel Peace Laureate 1980) – Implying 9/11 was an inside job:

You must not ignore the fact that investigators of the September 11 tragedy stated that the attack had a lot of “auto-coup” about it, like the plane against the Pentagon and the prior evacuation of offices in the towers.

Mairead Maguire (1976) – Comparing Israeli nuclear program to the Holocaust:

When I think about nuclear weapons, I’ve been to Auschwitz concentration camp… Nuclear weapons are only gas chambers perfected… and for a people who already know what gas chambers are, how could you even think of building perfect gas chambers?

Rigoberta Menchú Tum (1992) – Fabricating her autobiography, the events on which her peace prize was  based. From the New York Times, based on a decade of research by anthropologist David Stroll:

Ms. Menchu’s book cannot be the eyewitness account it purports to be because the Nobel laureate repeatedly describes experiences she never had herself.