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Sustainability !

What is environmental sustainability?

Promoting Environmental Sustainability

-Green building

• A green building is a building that has high-efficiency in the use of natural resources, water and materials that are used in designing and constructing the building.

• Environmentally Preferable Purchasing ,

often referred to as “green purchasing,“

is the affirmative selection

and acquisition of products and services

• A “green” production process refers to an effort to lessen the impact of the manufacturing process on the environment.

climate change ?.....

• Climate change is a change in the statistical

distribution of weather over periods of time that

range from decades to millions of years.

Here are some ADVERSE EFFECTS …

• Rising of sea level
• Flooding
• Change of weather pattern

CHANGE OF WEATHER PATTERN

GLOBAL WARMING

Global warming is the increase in the average temperature of Earth's near- surface air and oceans.

The Green

House Effect

• The rays of the sun warm the Earth.
• Heat from the Earth then travels back into the atmosphere.
• The gases in the atmosphere stop some of the heat from escaping into space and send them back

to the earth.

What would be our

globe without green house effect

• If there were no green house gases earth would have an expected temperature of 5.3 C.
• But the planet’s actual temperature is between 18-19 C.

Man made green house effect

&

Enhanced green house effect

What is Enhanced green house effect ?

• An increase in the concentration of greenhouse gases leads to an increase in the magnitude of the greenhouse effect..

• We are receiving energy faster than we reradiate it.

What can we do ?

Simply we can be energy efficient

nation

We can be environmentally sustainable

by using renewable energy resources.

What is renewable energy?.....

• Renewable Energy is a form of energy source that is replaced by a natural process at a rate that is equal to or faster than the rate at which that resource is being consumed.

Types of renewable energy sources

Hydropower

Wind power

Solar power

Bio-mass

Fuel cells

Geothermal energy

Types of renewable energy sources possible in Sri Lanka

What is hydro power ?

• Hydropower or hydraulic power is the power that is derived from the force or energy of moving water, which may be harnessed for useful purposes.

Hydroelectricity is the main source of energy in Sri Lanka, taking a share of nearly 45% of the total installed capacity in December 2009.

Currently, ten large hydroelectric power stations are in operation, all between 38 to 210 MW, with the Victoria Dam being the largest hydroelectric source.

Power generation in hydro power plant

Wind power

What is wind power.......

• Wind power is the conversion of wind energy

into a useful form of energy,

such as using wind turbines to make electricity, 

wind mills for mechanical power, 

wind pumps for pumping water or drainage etc.

Sri Lanka’s First commercial wind power plant

in Puthlam was opened on2010-03-22.

Capacity is 10 MW

Other Novel Designs

Why wind power ?....

• Wind is available free of cost
• Wind power doesn’t contribute to the exhaust of deadly pollutants.
• After purchasing the wind turbines, there are no more considerable investments involved.

SOLAR POWER

How do we convert sunlight in to electricity ?

• Using photovoltaic cells.

SOLAR CELLS

• A solar cell is a device that converts the energy of sunlight directly into electricity by the photovoltaic effect.

• Assemblies of cells are used to make solar panels, solar modules, or photovoltaic arrays. 

Process of Power generation in solar cells

Solar power in Sri Lanka

Why solar power ?.......

• The lack of pollution given off by solar panels when generating electricity.
• Another advantage of solar energy is that the energy source (the sun) is completely renewable.
• Ability to harness power in remote locations.

Environmental Concern

THANK YOU!

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• Concentrating solar power which normally focuses the sun's energy to boil water which is then used to provide power.
• Sterling engine dishes which use a sterling cycle engine to power a generator. 

HYDROPOWER

Upper Kothmale project

- Green building

- Green purchasing

- Green process and product design

Environmental sustainability is

about meeting the needs of the

present without compromising

future generations regarding the

environment.

A Solar power plant in US

Worlds largest solar power plant

China

• Allows the user to become less dependent on the worlds fossil fuel supplies, which are limited, and cause harm to the environment

GREEN PURCHASING

-

Green process and product design

This is a image of how flooding has affected a village

in Bangladesh

Here are satellite images of Florida set 30 years apart

Natural green house effect