Environmental Science 1021F/G Lecture Notes - Lecture 4: Primary Production, Tropical Rainforest, Subsistence Agriculture
19 Apr 2018
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Document Summary
The nation that destroys its soil destroys itself ~franklin d. roosevelt. Individual living thing: reacts, grows, reproduces, maintains homeostasis. Interrelationships between environment and living organisms; energy flow: organism, ecosystem, species (aquatic/terrestrial, wildlife (undomesticated) Environmental effects of food/fiber production: 30-40% of global cropland has been environmentally degraded. A few of the headlines: how urban soil farming could help feed more people: united nations has declared 2015 the. International year of the soils (april 2015: fertility of world"s soil reaching peak that will threaten food supplies, scientists warn. More must be done to preserve the long-term viability of existing farmland, the group of leading scientists argue (may 2015) Soil erosion may threaten global food security (may 2015: agroecology to reverse soil degradation and achieve food security (july 2015) Not dirt: mixture of eroded rock, organic matter, nutrients, water, air, living organisms (mostly detritivores) (considering living).
