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Lecture 30 - Humankind, the Environmental Crisis and the Future of Life on Earth

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Western University
Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 30Humankind the Environmental Crisis and the Future of Life in Earth y How will we go and when o Other than microbes that began pumping oxygen into Earths atmosphere in the Archaean humans are the only other organisms that have profoundly affected the Earth o Scientists are becoming increasingly concerned that our consumption of resources and disregard for the consequences of this consumption will bring an end to the age of humans y Events we have no control over o Bolide ImpactImpactor would have to be 15 km or more in diameterEstimated that impacts by objects of this size occur once in a million years o SupervolcanoEvery 50000 years or so a volcanic eruption capable of injecting enough ash and sulphur dioxide into the atmosphere to cause a dramatic effect on global climate for a few years o Cl
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