Earth Sciences 1083F/G Lecture : Lecture 30 - Humankind, the Environmental Crisis and the Future of Life on Earth

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Lecture 30 humankind, the environmental crisis and the future of life in y how will we go and when: other than microbes that began pumping oxygen into earth s. Impactor would have to be 1. 5 km or more in diameter. estimated that impacts by objects of this size occur once in a million years: supervolcano. every 50,000 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: climate change. average global temperatures have been climbing since at least the mid-1800s; accelerated since 1960: habitat destruction. destruction of habitat means lower biotic diversity, and in the case of forests, decreased consumption of atmospheric carbon dioxide: overpopulation and competition for resources. humans have a very high demand for food and energy. human carrying capacity is still up for debate.

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