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Planet Earth is 46 hundred million years old. If we scale this inconceivably vast timespan down to a more manageable 46 years, then modern man has been around for four hours, and the Industrial Revolution began a minute ago. During those 60 seconds of biological time, man has multiplied his numbers to plague proportions, ransacked the planet for fuels and raw materials, and caused the extinction of countless species of animals and plants.

What does 'biological' mean here?
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TakaWhat does 'biological' mean here?
Having to do with life. Biology is the study of living things. Hence, the time associated with the history of living things from the Industrial Revolution until now.

CJ
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Good! Just as I thought. Thanks, Jim!
As the paragraph says, During those 60 seconds of biological time, man has
multiplied his numbers to plague proportions, ransacked the planet for
fuels and raw materials, and caused the extinction of countless species
of animals and plants.
In this occasion, biological not only means the surge of human population on the Earth, also accompany by the massive extinction of species. These are all about biology, or creature stuff.