It is simply a matter of scale. Earth's processes do not respond to surface changes linked to global warming because these changes are irrelevant to the scales whereupon earth's processes operate. Surface changes are way, way behind the comma of the physical laws and the material properties that govern tectonic processes involved in generating earthquakes/volcanic activity; they do not matter, period. And hence earth processes do not physically or chemically respond to them, let alone reorganise as result to them.
It's the earth's more sensitive host on the surface, the biosphere, that does respond. Because humans, in our eye-blink of time, are not used to a sudden increase in rates of earth activity, it doesn't make us special, nor does it allow us to assign anthropomorphological features to the earth.
What if the tectonic system (which is probably more ancient than biological life, and is just as unique to Earth for what we know), being more slow and clumsy by orders of magnitude, is set on a critical level within own parameters, and hereby teleonomically ready to receive a signal from the atmosphere or whatever, a signal to let an overhauling hell loose? It would be just another instance of consequential reaction to a special condition...
