> on the scale of earth we might as well be microscopic.
The total biomass on earth is about 6x10^9 t whereas the total mass of the earth is about 6x10^21 t so all life on earth is microscopic on the scale of the earth. Also, your choice of words implies you’re mixing up quantity with quality. The fact that we’re microscopic on any scale doesn’t mean we’re as worthless as shower fungus. We churn up mountains to get a microscopic amount of gold by comparison because the gold is worth more than an average mountain.