Global Global WarmingWarming

What are the causes ? What are the causes ? What are the effects ? What are the effects ? How can we reduce it ?How can we reduce it ?

What is Global Warming ?What is Global Warming ?

Global Warming is the heating up of Global Warming is the heating up of our planet.our planet.

‘ ‘ The increase in the world’s The increase in the world’s average temperature, believed to average temperature, believed to result from the release of carbon result from the release of carbon dioxide and other gases into the dioxide and other gases into the atmosphere by the burning of fossil atmosphere by the burning of fossil fuels.’fuels.’

What causes Global What causes Global Warming Warming ? ?

Global warming is though to be due to the Global warming is though to be due to the enhanced greenhouse effectenhanced greenhouse effect..

The Earth is surrounded by a layer of The Earth is surrounded by a layer of gases, including carbon dioxide.gases, including carbon dioxide.

This keeps the Earth warm by preventing This keeps the Earth warm by preventing the escape of heat that would normally be the escape of heat that would normally be lost from the atmosphere. lost from the atmosphere.

The gases act rather like the glass in a The gases act rather like the glass in a greenhouse.greenhouse.

They let in heat but prevent most of it They let in heat but prevent most of it from getting out.from getting out.

It works just like a It works just like a greenhouse …… letting greenhouse …… letting more heat in than out. more heat in than out.

The Greenhouse EffectThe Greenhouse Effect

What causes Global What causes Global Warming Warming ??

The burning of fossil fuels such as oil, The burning of fossil fuels such as oil, coal and natural gas produces large coal and natural gas produces large amounts of carbon dioxide.amounts of carbon dioxide.

As the amount of this gas increases, As the amount of this gas increases, the Earth becomes warmer.the Earth becomes warmer.

Diagram of the Diagram of the Greenhouse Effect.Greenhouse Effect.

Label your diagram of the green house Label your diagram of the green house effecteffect

What are the greenhouse What are the greenhouse gases ?gases ?

CARBON DIOXIDECARBON DIOXIDE

Carbon dioxide is produced by Carbon dioxide is produced by power stations, factories and road power stations, factories and road vehicles that burn fossil fuels.vehicles that burn fossil fuels.

Deforestation and the burning of Deforestation and the burning of rainforests also produces carbon rainforests also produces carbon dioxidedioxide..

METHANEMETHANE

Methane is released from waste Methane is released from waste dumps, farms and rice fields.dumps, farms and rice fields.

NITROUS OXIDESNITROUS OXIDES

Nitrous oxides are Nitrous oxides are emitted from car emitted from car exhausts, power exhausts, power stations and stations and fertilisers.fertilisers.

CFC’s CFC’s (chloroflurocarbons)(chloroflurocarbons)

These are released from aerosols, These are released from aerosols, plastic, foam packaging and fridges.plastic, foam packaging and fridges.

They are the most dangerous of They are the most dangerous of greenhouse gases as they absorb greenhouse gases as they absorb more heat than carbon dioxide.more heat than carbon dioxide.

What greenhouse gas is What greenhouse gas is produced from each produced from each

photo ?photo ?

What are the effects of What are the effects of Global Warming ?Global Warming ?

The world is now warmer than it has The world is now warmer than it has been for thousands of years.been for thousands of years.

In the 20In the 20thth century, average century, average temperatures rose by 0.6’C, with most of temperatures rose by 0.6’C, with most of this increase in the last 40 years.this increase in the last 40 years.

The warmest years ever recorded were in The warmest years ever recorded were in 1990 and in 1995.1990 and in 1995.

By 2100, it is predicted that the average By 2100, it is predicted that the average global temperature could be between 1.6 global temperature could be between 1.6 and 4.2’C higher than it is today.and 4.2’C higher than it is today.

What are the effects of What are the effects of Global warming ?Global warming ?

NOBODY KNOWS EXACTLY WHAT THE NOBODY KNOWS EXACTLY WHAT THE EFFECTS WILL BE !!!EFFECTS WILL BE !!!

?? However, scientists are in agreement However, scientists are in agreement

that changes in that changes in world climatesworld climates and and sea-levelssea-levels are almost inevitable. are almost inevitable.

Below are some of the Below are some of the predicted effects of global predicted effects of global

warming.warming.Sea temperatures Sea temperatures will rise. Water will will rise. Water will expand and sea expand and sea levels could rise by levels could rise by 0.25-1.5m0.25-1.5m

There may be There may be more violent more violent storms and storms and weather extremesweather extremes

Some plants and Some plants and animals would animals would become extinct.become extinct.

Ice caps and Ice caps and glaciers will start glaciers will start to melt causing to melt causing sea levels to rise sea levels to rise furtherfurther

Hot regions would Hot regions would become hotter become hotter and deserts would and deserts would spread.spread.

There could be an There could be an increase in insect increase in insect pests like aphids pests like aphids and fleas.and fleas.

Low-lying Low-lying areas would be areas would be flooded eg fensflooded eg fens

Climatic and Climatic and vegetation belts vegetation belts would move.would move.

Tropical diseases eg Tropical diseases eg malaria may spread malaria may spread to temperate regions to temperate regions such as UK.such as UK.

What could the UK be like What could the UK be like in 50-100 years time ?in 50-100 years time ? Write a list of ideas to describe what Write a list of ideas to describe what

the UK could be like if global the UK could be like if global warming continues at this pace. warming continues at this pace. ((p105KG and DME may help). p105KG and DME may help).

Eg no skiing in Scotland (as no snow). Eg no skiing in Scotland (as no snow).

What could the UK be like What could the UK be like in 50-100 years time ?in 50-100 years time ?

What can we do ?What can we do ? Gaining international agreement to reduce Gaining international agreement to reduce

the releases of greenhouse gases is the releases of greenhouse gases is difficult.difficult.

MEDC’s eg USA are reluctant as it would MEDC’s eg USA are reluctant as it would be expensive and there may be job losses be expensive and there may be job losses as well as lowering of their standard of as well as lowering of their standard of living.living.

LEDC’s are also reluctant as they need LEDC’s are also reluctant as they need energy to create new jobs and raise their energy to create new jobs and raise their living standards.living standards.

Many countries also fail to see why its Many countries also fail to see why its their problem – they didn’t create it!!their problem – they didn’t create it!!

WHICH COUNTRIES HAVE WHICH COUNTRIES HAVE PRODUCED MOST OF THE PRODUCED MOST OF THE GREENHOUSE GASES ?GREENHOUSE GASES ?

What is the KyotoWhat is the Kyoto Protocol ? Protocol ?

In 1997, the Kyoto Protocol brought In 1997, the Kyoto Protocol brought agreement between countries that agreement between countries that greenhouse gases should be reduced. greenhouse gases should be reduced.

So far, many European countries eg So far, many European countries eg Britain, have admitted difficulty in Britain, have admitted difficulty in achieving the target.achieving the target.

In 2001, despite producing 25% of the In 2001, despite producing 25% of the world’s greenhouse gases already, world’s greenhouse gases already, president Bush stated that the USA would president Bush stated that the USA would not be reducing emissions to the agreed not be reducing emissions to the agreed levels.levels.

What can WE do in our What can WE do in our everyday lives to reduce everyday lives to reduce

greenhouse gas emissions ?greenhouse gas emissions ?

What are the effects of What are the effects of Global Warming?Global Warming?

1.1. Using the information from today’s lesson, Using the information from today’s lesson, describe the effects that the increase in describe the effects that the increase in global temperature is causing in:global temperature is causing in:

a)a) The UKThe UKb)b) EuropeEuropec)c) The rest of the worldThe rest of the world

HINT! Make sure that you include facts, sketch HINT! Make sure that you include facts, sketch graphs etc in your description. I have maps if graphs etc in your description. I have maps if you want them!you want them!

QUESTIONSQUESTIONS

1.1. Why is Why is INTERNATIONALINTERNATIONAL agreement agreement necessary for the reduction of necessary for the reduction of greenhouse gases ? greenhouse gases ?

2.2. Why is it difficult to get this ?Why is it difficult to get this ?3.3. What can we do to reduce the What can we do to reduce the

Enhanced Greenhouse Effect?Enhanced Greenhouse Effect?4.4. Why is ‘think global, act local’ a Why is ‘think global, act local’ a

good idea?good idea?