 Reviewers also noted the environmental theme in the book . Kirkus Reviews found that " With the impending threat of global warning as an ominous backdrop , teens from very different worlds find they have much in common " . In the novel , Peter finds an underground civilization beneath Greenland that is sinking as a result of global warming . Burns felt that First Light is a " great discussion starter of issues ranging from global warming to shunning and building a new society " . VOYA recognized the global warming theme and also classified First Light as a coming @-@ of @-@ age tale . 
 Reviewers also noted the environmental theme in the book . Kirkus Reviews found that " With the impending threat of global warning as an ominous backdrop , teens from very different worlds find they <a href='got' title='1'><mark>have</mark></a> much in common " . In the novel , Peter <a href='uninflect' title='2'><mark>finds</mark></a> an underground civilization beneath Greenland <a href='null_relcl' title='3'><mark>that</mark></a>is sinking as a result of global warming . Burns felt that First Light is a " great discussion starter of issues ranging from global warming to shunning and building a new society " . VOYA recognized the global warming theme and also classified First Light as a coming @-@ of @-@ age tale . 
Reviewers also noted the environmental theme in da book . Kirkus Reviews found that " wid tdaimpending threat of global warning as an ominous backdrop , teens from very diffrent worlds find they got much in common " . In the novel , Peter find an underground civilization beneath Greenland is sinking as a result of global warming . Burns felt that First Light is a " great discussion starter of issues ranging from global warming to shunning and building a new society " . VOYA recognized the global warming theme and also classified First Light as a coming @-@ of @-@ age tale .