ENV-1010 Lecture Notes - Lecture 24: Silt
13 Sep 2016
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When it costs more to find, extract, process, etc. than the resource is worth: we measure: Depletion time time it takes to use 80% of a reserve after 80% removal reserve is economically depleted. Reserve to production ratio number of years a reserve will last at current production. Exploration expensive 1 in 10,000 sites are economically productive: energy resources. 99% of all energy on earth comes from the sun. Sun also produces renewable sources: wind, hydropower, solar, biomass. Non-renewable energy use: energy use trends. 4. 6% of world population consumes 26% of world commercial energy: compared to india. 16% of the world"s population and consumes about 3% of the world"s commercial energy. Why we use fossil fuels: net energy total amount of energy available minus energy needed to find and process reserves. Coal 3. 9-4. 0:1: change to renewable energy takes approximately 50 years to change energy supply.
