science form 4 chap4

APPLICATION OF GREEN TECHNOLOGY
IN WASTE AND WASTEWATER
MANAGEMENT

Treatment and processing (biological process)

Enables waste to be converted into beneficial organic
substances such as organic fertilizers.

Convert solid waste into a main source of renewable
energy (biomass)

APPLICATION OF GREEN TECHNOLOGY
IN WASTE AND WASTEWATER
MANAGEMENT

Refuse , Reduce, Reuse, Recycle and Recovery (5R)

Replace 3R concept
Addition two‘R’ at the beginning and at the end –’refuse’

and ‘recovery’ is aimed at achieving zero waste

How do you practice 5R concept at home?

TOPIC 4.4

AGRICULTURE AND FORESTRY
SECTOR

SOSIOSCIENTIFIC ISSUES

• Increase in population and change in

lifestyle are among the factors that

contribute to the : Did you know that these

• High demand for new settlement areas issues would become a
huge disaster?
• Sufficient food supply

• Good transportation route

EXAMPLE : Forest Exploration

1. Deforestation for the purpose of development cause

i. Landslides
ii. Floods
iii. Extinction of flora and fauna

2. High demand for furniture and paper usage
3. Interfere gas cycle of Earth
4. Conversion of gas CO2  O2 occur during photosynthesis by plant

Example : Forest Exploration

EXAMPLE :Open Burning

• Carried out by farmer an

cause
• Haze
• Compromise the air quality

EXAMPLE : Widespread use of pesticides
and chemical fertilisers

• Cause soil pollution of agriculture land
• Acidity of the soil increase, making it not suitable for agriculture
• Chemical substances absorbed by the soil flow into the river
• Contaminate the river

APPLICATION OF GREEN TECHNOLOGY

Treating and processing agricultural waste into compost
Replanting tree can maintain the existing species
Logging activities have to be regulated to conserve forest resource

More forest reserve have to be gazette to balanced ecosystem

TOPIC 4.5

TRANSPORTATION SECTOR

SOSIO-SCIENTIFIC ISSUES

Transportation is one of the main contributor to air pollution

• 95% of motorised vehicles • Fumes emitted by vehicles
used petrol dan diesel obtain contain gases such as carbon
from petroleum dioxide and carbon monoxide

• 60% petroleum used in • Cause greenhouse effect
transportation sector
• Contribute to drastic climate
• Petroleum is a non-renewable change
source can be deplete

SOSIOSCIENTIFIC ISSUES

Dangerous Destroys plant,
gases emitted corrodes
from vehicles
building and
iron, and

damage tyres
on vehicles

APPLICATION OF GREEN
TECHNOLOGY

Green Transportation

 Transportation that releases very minimal greenhouse gases or
none at all

 Example : vehicle use renewable energy

Mode of green transportation

APPLICATION OF GREEN
TECHNOLOGY

Invention of • Use liquefied natural gas (LNG)
Natural Gas or compressed natural gas
Vehicle (NGV) (CNG)

• Vehicles rely on petrol can be
modified to use LNG / CNG

Biofuel as an • Produced from plant oils +
alternative for animals fat fatty acid methyl
ester
petroleum
• Renewable energy source
• Environmentally - friendly

ELECTRIC BUS IN MELAKA

TOPIC 4.6

GREEN TECHNOLOGI AND LIFE

ROLE OF INDIVIDUALS IN MANAGING GLOBAL
WARMING AND CLIMATE CHANGE IN ORDER TO
REDUCE CARBON FOOTPRINT

Carbon footprint

o Is the Amount of greenhouse gas, such as

carbon dioxide (CO2) released into the
atmosphere as a result of human activities such
as :

o Open burning
o Burning of fossil fuels

Low carbon footprint could
reduce the Impact of Climate Change