PUBHLTH 1 Lecture Notes - Lecture 97: Jack Kevorkian, Kyoto Protocol, Arable Land
Document Summary
S curve - an "s" curve (on a population chart) reaches its carrying capacity and levels. J curve - "j" curve hits its carrying capacity and just continues causing a population explosion and competition for resources. Demographic transition - birth rates tend to fall as a result of falling death rates. Hiv/aids - shorten life expectancies in africa. Carrying capacity - the number of organisms that can be supported without degrading environment. Uneven distribution of resources across globe - fresh water: drinking, cooking, washing, agriculture. Arable land: amount of land under cultivation is declining. Food from sea: decline of harvests of fish and shellfish. Climate change - greenhouse effects from burning fossil fuels. Rise of 1 degree during the 20th century. Predicts 3 to 7 degree rising during 21st century. U. s has 5% of world"s population, contributes to 30% of green house gases. China, with 20% of world"s population has become the leading emitter with 21%.
