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Climate Change in Hong Kong (Suitable for primary school) Breathing breathe in oxygen breathe out c arbon dioxide Photosynthesis in plant breathe out oxygen breathe in carbon dioxide Burning and electricity generation carbon dioxide carbon dioxide power plant

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climate change in hong kong

Climate Change in Hong Kong

(Suitable for primary school)

slide2

Breathing

breathe in oxygen

breathe out carbon dioxide

slide3

Photosynthesis in plant

breathe out oxygen

breathe in carbon dioxide

power plant

Burning and electricity generation

carbon dioxide

carbon dioxide

power plant

burning of coal , petroleum and natural gas to generate electricity

cooking with fire

slide5

The sun gives energy to the earth

sunlight

heating of the earth

slide6

Heat dissipation by the earth

heat dissipation by infra-red radiation

sunlight

slide7

Carbon dioxide lowers heat dissipation

carbon dioxide in the atmosphere

slide8

Relationship between carbon dioxide and the earth’s temperature

increase carbon dioxide in the air

decrease heat dissipation by the earth

rise in global air temperature

slide9

Use of electricity leads to the rise in global temperature

require burning of coal, petroleum and natural gas,

release carbon dioxide into the air

rise in temperature

use of electrical appliance

slide10

Use of paper and wooden furniture lead to the rise in global temperature

less trees to absorb carbon dioxide

rise in temperature

use paper and wooden furniture

Trees are cut down to make paper and furniture

slide11

Rise in sea level

- expansion of water by heating

- melting of ice on land

slide12

Expansion of water by heating

water expands when heated, water level rises as a result

water

water

Rise in global sea temperature leads to expansion of sea water and a rise in sea level

heating

slide13

Melting of ice caps in polar land and glaciers in high mountains

1928

2000

( Source : US Geological Survey)

slide14

Rise in sea level by melting of glaciers

ice block

ice block

water

water

more ice blocks melt, the water level in the flask will rise

ice blocks melt, water flowsinto the flask

easier flooding of coastal areas during typhoon attack or heavy rain

Sea level rise makes flooding of the coastal areas easier

waves caused by typhoon

coast

Easier flooding of coastal areas during typhoon attack or heavy rain

rose in sea level

coast

(Source: US National oceanic and Atmospheric Administration)

slide17

More and more heavy rain

( Source : Geotechnical Engineering Office )

dangerous to picnic and hiking activities

leads to landslide

slide18

More and more mosquitoes

more mosquitoes,easier to transmit dengue fever

( Source : HK Education City, and Food and Environmental Hygiene Department )

slide19

Can air-conditioner stop global warming?No!

increase in electricity usage, require burning of more coal, petroleum or natural gas, release more carbon dioxide,result in global temperature rise

turn on air-conditioner and lower the conditioner’s temperature

drop in indoor temperature

slide20

What should I do?

Save electricity

(Source : Electrical and Mechanical Services Department)

slide21

Take care of trees

Prevent hill fire

Save paper

Plant more trees

(Source: Agriculture, Fisheries and Conservation Department)

slide22

Reduce expenditure

Large amount of energy is used to produce commercial products and releasecarbon dioxide