2. The natural reources.
• Why only earth is resilient for life?
• The distance is just right.
• It is revolving around sun.
• Temperature remained within narrow ranges
of 10-20 C
• Constitution of gases is the same as 4.7 mya.
3. The natural world
• Life on earth has excited for 4 B years during which it
has increased in diversity to the richness we see
today. Human activity is threating to wipe out a large
proportion of this biodiversity within a tiny fraction
of that time.
• To date , some o 1.5 M species have been described,
but the vast majority are still unknown.
• Biodiversity is unevenly distributed among taanomic
groups with disproportionately large number of
species in the class insecta.
4. continued
• biodivrsity increases from the polesto the tropics
but there is no consensus as to why this is so. It
has been suggested that this is because the
tropics are more climately stable or because the
tropics receive more energy inputb from the sun.
• Economic values have been placed on
biodiversity to enable us to compare benefits of
consrvation versus development,but the apritual
value of biodiversity remains fundamentally
important to many people.
5. Patterns of biodiversity
• Diversity increases from poles to tropics.
• catastrophe hypothesis
• .Evolutionary speed hypothesis
• Energy input hypothesis
• Productivity hypothesis
6. Why to conserve the species?
• Because diversity have same values :
• Direct use values: economic values of natural goods.
• Indirect use values: the economic value of natural
services i.e provision of water, clean air recreational
space.
• Option values: the econo,ic value of future benefits
that a natural area can provide.
• Existance values: the economic value of a habitat/
species based on the amount people would be
willing tompay to avoid destruction.
8. Continue
• Geological hazards
• Hydrological hazards
• Metrological hazards
• Extra_Terresestrial hazards
• Characteristics of Natural hazards
• The hazards are inevitable.
• They are there to maintain the earth dynamic
equilibrium.
• They are unstopable.
