Lever-Tracy 2010, pp.  255: "In sum, we see that manufacturing uncertainty over climate change is the fundamental strategy of the denial machine As we reflect on the evolution of climate science and policy-making over the past few decades, we believe the denial machine has achieved considerable success – especially in the US but internationally as well.
Truy cập ngày 23 tháng 10 năm 2014.  ^ Lever-Tracy 2010, tr. 255: "In sum, we see that manufacturing uncertainty over climate change is the fundamental strategy of the denial machine As we reflect on the evolution of climate science and policy-making over the past few decades, we believe the denial machine has achieved considerable success – especially in the US but internationally as well. ^ a ă Corcoran, Terence (6 tháng 1 năm 2010).