The documentary deals with Kiribati which is facing the threat of being submerged over the next few decades due to rising water levels.
Kej said that in Kiribati, he was granted the opportunity to record an extended interview with Kiribati's three-time President Anote Tong, whose speech at the December 2015 United Nations COP21 conference in Paris had inspired him.
Tong was in office from July 10, 2003-March 11, 2016.
"At the conference, Tong had called for bold action to address climate change and his message to the conference could not have been clearer," Kej told PTI on World Environmental Day today.
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"For many world leaders, climate change exists as an abstract concept or a theory that remains to be proven, but for Tong, it is a reality he faces every day," Kej said.
Kej said Tong told him that the Fourth Assessment Report of the Inter-governmental Panel on climate change was fairly conclusive that it (climate change) was human induced and that within this century, countries like his will be under water.