7/28/2019 Copy of ENV101 lecture 1

1/14

ENV101

Shahnewaj Chowdhury

7/28/2019 Copy of ENV101 lecture 1

2/14

ENVIRONMENT

Environment can be defined as the circumstances orconditions that surround an organism or group oforganisms.

The complex of social or cultural conditions thateffects an individual or community.

The word Environment was originated from theFRENCH word ENVIRONNER,which means to

encircle or surround. Environment are of different types

Naturals,Educational,Social,Economical,Political,Cultural etc.

7/28/2019 Copy of ENV101 lecture 1

3/14

ENVIRONMENTAL SCIENCE

Environmental Science is the systematic study of our

environment and our proper place in environment.

A relatively new field,Environmental Science,is highly

inter-disciplinary,integrating,natural science,social

science and humanities in a broad holistic study of a

world around us.

Environmental Science is mission oriented.

It seeks new,valid,contextual knowledge about the

natural world and our impacts on it.

7/28/2019 Copy of ENV101 lecture 1

4/14

RESOURCES

From a human stand point,a resource is

anything obtained from the environment tomeet human needs and wants.

7/28/2019 Copy of ENV101 lecture 1

5/14

RESOURCES

PERPETUAL

Solar

Direct solar energy

Wind flow,tides,flowingwater.

NON-RENEWABLE

Fossil-fuels

Metallic

minerals(Iron,Cu,Zn,Aletc)

Non-metallic

minerals(sand,clay)

7/28/2019 Copy of ENV101 lecture 1

6/14

RE-NEWABLE RESOURCES

Air

Water

Plants and Animals

Fertile land

7/28/2019 Copy of ENV101 lecture 1

7/14

POLLUTION

Contamination of environment as a result

of human activities is called Pollution.

7/28/2019 Copy of ENV101 lecture 1

8/14

The term Pollution refers to the

following of

Air,Water,Land,Soil,Sea,Noise,

Solid waste etc.

7/28/2019 Copy of ENV101 lecture 1

9/14

AIR POLLUTION

INTERNAL SOURCE

Dust

Burning wood

Tobacco Coal burning

Air Conditioner

Coil

Spray(aerosol,bodyspray)

EXTERNAL SOURCES

Smoke of vehicles

Brick fields

Industries Dust from the

construction

Smoke from burning

solid waste Coal factories

7/28/2019 Copy of ENV101 lecture 1

10/14

EFFECTS OF AIR

POLLUTION

Heart attack

Respiratory diseases

Lung cancer

Dizziness Bronchitis

Nausea

Asthma Green house effect

Acid Rain

7/28/2019 Copy of ENV101 lecture 1

11/14

WATER POLLUTION

Any physical,biological or chemical change in

water quality that adversely affects livingorganisms or makes water unsuitable for

desired uses can be considered water

pollution.

7/28/2019 Copy of ENV101 lecture 1

12/14

CAUSES OF WATER

POLLUTION

Pathogens

Organic wastes

Organic and inorganic chemicals

Toxic metals

Inorganic plant nutrients

Non-native species

Sediments

7/28/2019 Copy of ENV101 lecture 1

13/14

EFFECTS OF WATER

POLLUTION

Typhoid

Cholera

Bacterial diseases

Dysentery

Polio

Hepatitis

Malaria

7/28/2019 Copy of ENV101 lecture 1

14/14

Thank You