What does that even mean?
You have one point "it's a conservative think tank" - which does not mean anything - coupled with another empty statement.
Now I sure don't mind criticism of that entity, but I find it ironic that it is done with such an empty statement that's just a not very cleverly disguised type of ad hominem attack.
May I suggest you take some time actually reading the paper and then coming back with criticism of their actual points?
While the report itself may not push an obvious partisan agenda, a critical reader should consider the conservative agenda of the NAS in relation to why they might publish such a report. In the conservative wing's long-standing opposition to science, it's not far-fetched to view this report as being published tactically -- even if all of its points are well-founded -- as something to point to when future efforts attempt to undermine science-based policy on issues like climate change, stem-cell research, abortion, etc.
Especially when the President of the NAS is a public "climate skeptic".
https://www.chronicle.com/blogs/innovations/bottling-up-glob...
Also from the intro: The National Association of Scholars (NAS) has long been interested in the politicization of science.