A viewer asks: “What is the cause of the overall gross decline in CO2 over at least the past 140 million years? Was this Creator preparing the nest for humans and the ecosystems supporting us?”

This is indeed what happened and is a mix of circumstances and energies, because the interlopers returned and did explorations here and did further perturbations of the Earth, seeing its relocation and then wanting to, again, spoil the future of the planet and did some further manipulation to make it vulnerable to solar radiation. So this change in the atmospherics needed to be dialed back, so to speak, to provide a friendlier set of conditions to support not only plant life but animal life as well and that indeed was the reason for the gradual reduction in CO₂ levels through a reduction in the average temperature and this reduced plant life accordingly, but created less harsh conditions to eventually have things in a range where humanity could survive and thrive with its fragile nature.