It seems to me that what we call "history" is largely concerned withthe description or explanation of past episodes in the social, political, military,artistic, intellectual, etc. life of humans. Study of past episodes of non-human activity, for instance, the movementof tectonic plates and the formation of stars, tends to go by other names, like "geology" or "astronomy". So perhaps it's no wonder that the doings of humans take center stage in what we call "history". (That said, plenty of histories do deal with the human consequences of natural events beyond our control.)
Why do historians write as if Man were the pre-eminent factor in shaping events when so much is decided by scientific factors (and negative ones, like the absence of viruses and meteors)?