Can ' t believe how fast this money is being raised . <| sep |> The signatories are also all former NASA staff . Considering that NASA currently has a staff of 18 , 000 and many more retired and former , the proportion of NASA staff represented by this letter is very small . Thank you . Even if you ignore every other flaw , this alone should be enough to treat it with little credibility . In any organization even close to the size of NASA you will find huge numbers of differing opinions . The fact that they found 50 people with no or very limited relevant expertise who don ' t believe is not terribly surprising . And to all the deniers who will scream But Al Gore ! !!!!!!, the point is not that these people have no expertise , so they should be ignored . The point is these people have no expertise , so their views should be treated as nonexpert opinions and taken with a grain of salt . Exactly as Al Gore ' s is . Gore is a spokesman , not an expert . Edit Holy shit , I never knew that about Harrison Schmitt . After seeing his story in From the Earth to the Moon , I grew to have a ton of respect for him . It is incredibly sad that a once great scientist has bought into that bullshit .