Lecture 9: Ecology n What is the effect on global ecosystems of a meat based diet?: Population carrying capacity Energy requirements Pollution Land water and air resources Endangered species
Lecture 9: Ecology What is the effect on global ecosystems of a meat based diet?: – Population carrying capacity – Energy requirements – Pollution – Land, water and air resources – Endangered species
Ecology(cont) What is the present state of global ecosystems? Population will increase 7 fold to 40B at current rate of fertility 25% of all species likely to become extinct in next 30 years n where will new anticancer drugs and herbal medicines come from? o Arable and permanent cropland acres per capita are steadily reducing worldwide
Ecology (cont.) What is the present state of global ecosystems? – Population will increase 7 fold to 40B at current rate of fertility – 25% of all species likely to become extinct in next 30 years where will new anticancer drugs and herbal medicines come from? Arable and permanent cropland acres per capita are steadily reducing worldwide
Ecology(cont What is the present state of global ecosystems(cont ) Of 76 countries that encompass tropical orests, only 4-Brazil, guyana, Papau New Guinea and Zaire- are likely to retain major tracts by 2010 From 4B-6 4B people worldwide who will live on coasts by 2025 resently 2B people live with water constraints each year. o fresh drinking water predicted to be #1 source of global conflict in 21st century
Ecology (cont.) What is the present state of global ecosystems (cont.)? – Of 76 countries that encompass tropical forests, only 4 - Brazil, Guyana, Papau New Guinea and Zaire - are likely to retain major tracts by 2010. – From 4B - 6.4B people worldwide who will live on coasts by 2025. – Presently 2B people live with water constraints each year. fresh drinking water predicted to be #1 source of global conflict in 21st century
Ecology(cont.) u Cost of New Electrticity Generation (cents per kWh in constant 1987$) Geothermal 5.5 Coal 5.75 o could be big trouble with china Biomass 6.00 Wind 6.00 Natural gas 6.25
Ecology (cont.) Cost of New Electrticity Generation (cents per kWh in constant 1987$): – Geothermal 5.5 – Coal 5.75 could be big trouble with China – Biomass 6.00 – Wind 6.00 – Natural Gas 6.25
Ecology(cont n Cost of New Electricity Generation (cont.) Solar thermal 6.50 Nuclear 7.00 Hydroelectric 12.00
Ecology (cont.) Cost of New Electricity Generation (cont.) – Solar thermal 6.50 – Nuclear 7.00 – Hydroelectric 12.00