8.1 Effects of Population Explosion

7/24/2019 8.1 Effects of Population Explosion

http://slidepdf.com/reader/full/81-effects-of-population-explosion 1/12

Biology 1b Evolution and EnvironmentBiology 1b Evolution and EnvironmentGCSEGCSE CORECORE

Made by = Yashika, Sapna,

Vanshika, Harshit, Harsh,Paras, Prince Bindal

Submit to = Mr. Sunil Jindal




Key words: non-renewable, pollution,waste, indicators




Objective

How does population increase effect the earth?How does population increase effect the earth?

Success Criteria

By the end of the lesson I:

• know that there are increasing numbers of people on theplanet

• can explain that an increase of people on the world

increasing the depletion of natural resources and producesmore waste and pollution




Human impact on the environmentHow does human activity affect the environment?




There are about 6.6 billion people in the world and over 95

million babies are born per year that is an avera!e of

three babies per second"

Population ro!th

Has the rate of population !rowth always been the same?




The human population is said to be !rowin! exponentially.

This means that the lar!er the population# the faster it !rows.

"#ponential ro!th

$n increase in avera!e life expectancy is lar!ely

responsible for the rapid increase in population. %hy do

people live lon!er than they did hundreds of years a!o?

better healthcare &hospitals# medicines# vaccines'

more and better food

cleaner water

better sanitation

The bi!!est increase in population is in developing nations#

rather than developed nations. %hy do you thin( is the case?


http://slidepdf.com/reader/full/81-effects-of-population-explosion 7/12Biology 1b Evolution and EnvironmentBiology 1b Evolution and EnvironmentGCSEGCSE CORECORE

$he chanin population



)omputer models can be used to ma(e predictions about

population !rowth by usin! assumptions about birth rate.

Predictin %uture ro!th rate

*ost analysts assume that birth rates will fall within the

ne+t 5, years. %hy do you thin( this mi!ht happen?

How important do you thin( predictions about climate

chan!e and unsustainable development are in the analysts-

calculations?

decreased fertility

lac( of resources

disease

war



use moreraw materials

usemore energy usemore land more people

buildin!s# farms#

uarries anddumps fossil fuels

&sin resources and producin pollution

produce

more wasteand pollution

sewa!e# fertili/erand to+ic waste

)01# 201# )0 and smo(e

pesticides andherbicides

minerals



'hat are pollutants(

$ pollutant is a substance that contaminates air# water or

land. 2ome pollution is caused by natural events such as

volcanic eruptions# but the ma3ority is caused by human

actions. 4ollutants are either:

biodegradable &e.!. sewa!e' these are usually only

dama!in! when added to the environment more uic(ly

than they can decompose.

non-degradable &e.!. the pesticide T' these

decompose e+tremely slowly# allowin! them to accumulate

to to+ic levels as they are passed alon! food chains.

0ne of the bi!!est problems of a risin! population is an

increase in pollution.



'hat are indicator species(

ichen is commonly

used as an indicator

species because it issensitive to sulfur

dio+ide.

%hat type of

pollution could bepresent in areas

where there is not

much lichen?

Indicator species are or!anisms whose presence or

absence provides information on the environmental

conditions in a specific area.



$H)*+S

8.1 Effects of Population Explosion

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