EAS100 Lecture Notes - Lecture 38: Clearcutting, Overexploitation, Pegmatite

• School: University of Alberta
• Department: Earth and Atmospheric Sciences
• Course: EAS100
• Professor: Daniel Alessi

Document Summary

Eas 100 lecture 38 the anthroposphere and resource cycle. Managing renewable resources: fish, trees, etc. renewable if managed properly, can still deplete if used too quickly, use at rate of replenishment to maintain state, aim for maximum sustainable yield (msy) If these resources are too severely depleted, it may not be able to regenerate on a human timescale: ex: forests. In human bodies, bacteria outnumber our cells 100 1 and perform digestion and other essential processes. Impact of eating foods with pesticides and chemicals not yet entirely known 80% of the microbials in our bodies not understood: compaction driving equipment over soil, watering land with water with higher salinity builds up, erosion. Water resources: fresh water essential for people, ecosystems, industry, agriculture, recreation, transportation, fisheries. Irrigation is 75% of water demand: global use tripled since 1950, threats, mining of groundwater, aquifer can collapse and be permanently damaged, contamination, lack of adequate supply.