ENV250Y5 Lecture Notes - Lecture 10: Pedogenesis, Justin Trudeau, Nutrient Cycle
Document Summary
Mean variation in live forms between 10-30million spices on earth. We are finding spieces all the time. Haven"t been able to discover and classify it all. Fewer mammal than plant and insects (about 5000 mammals: we tend to think of mammals not the others. We are going through the 6th major extinction the first that is man created. Most of the bio diversity is along the equator in rainforests. Arctic has the least amount of biodiversity. 40% of canada is in the north. Canada doesn"t have a lot of biodiversity. Living and nonliving components interact to form a complete interdependent system. Us has about 1300 spices at risk, canada has 500. Prairies are the most at risk ecosystem. 50% of wetlands has been drained and filled. 90% of the west coast is deforested. Bats tend to be of special concern. Imagining that earth is a spacecraft moving through space that cannot stop and be refueled.
