Volcanic activity, then, sends the CO 2 up to the surface, replenishing the atmosphere. Both tectonic motions and volcanism must operate in balance to maintain this steady cycling of CO 2 and carbonates. In the past, the levels of such activity were significantly higher. The larger and more advanced a life form, the more vulnerable it will be to the CO 2 balancing forces. And yet without earthquakes and volcanoes, CO 2 levels would be inadequate to support life.
Humans appear on the scene at the ideal moment for atmospheric and ground level survival conditions.
Primitive life appears as soon as it could possibly survive, thus maximizing humans' organic resources such as top soil, coal, oil, gas, and diverse plant and animal species. This timing and balancing reflect either a probability defying matrix of coincidences or the careful plan of an involved Creator. You already know my choice of interpretations. Ron Cowen, p. 205. Hugh Ross, pp.