Transcript Lesson 2 revision Climate and Change

Unit 1 Revision
Topic 2: Climate and Change
Main points you need to know
• Natural causes of climate change
• How the greenhouse effect works
• How humans are enhancing the
greenhouse effect
• What climate and sea level changes
scientists predict for the future
• How climate change might affect the UK
and other countries
Natural climate change
• How many words, 3 letters or more, can
you make from the following word in 30
seconds…
How many words, 3 letters or more,
can you make from the following word
in 30 seconds…
MILANKOVITCH CYCLES
Natural causes of climate change
1. Milankovitch cycles (changes in the earth’s
orbit)
2. Sunspot theory (sun’s energy varies)
3. Volcanic eruptions – eg Mt Pinatubo
erupted in
1991, cooled global temperature by 0.5 degrees for a
year. Increases temperature in the long term. Why?
Pinatubo clip
• http://www.bbc.co.uk/learningzone/clips/po
werful-volcanic-eruptions-mountpinatubo/1503.html
Causes of climate change
• http://www.bbc.co.uk/learningzone/clips/ca
uses-of-climate-change/1491.html
• Write 5-7 key words as you watch this clip
Practice question
• Explain possible reasons why climate can
change naturally.
(4 marks)
(4 mins)
SELF ASSESSMENT:
Explain possible reasons why climate can
change naturally.
• 4 marks = 4 points (or two points each
explained.
• Eg – Climate can be affected by the earth’s orbit
around the sun (Milankovitch cycles).
Sometimes we are closer to the sun so our
climate is warmer, other times we are further
away and so colder as less heat energy reaches
us. Also, volcanoes can affect our climate as
sometimes when they erupt and release ash into
the atmosphere the sun’s energy gets blocked
out and so we are colder.
Britain’s Little Ice Age (1300-1850 AD)
• Look at the picture.
• How were people affected by the Little Ice
Age?
The Greenhouse Effect
• The greenhouse effect is natural.
• Without it the world would be 33 degrees
cooler (on average -18 degrees)
• Humans are adding to the greenhouse
effect, causing an
ENHANCED GREENHOUSE EFFECT
The Greenhouse Effect
• Study this diagram for 30 seconds…
1 minute to draw a diagram of
the greenhouse effect from
memory over half a page
How did you do?
Give yourself a mark out of 5.
The ENHANCED Greenhouse
Effect
• List 5 ways in which humans are
enhancing the greenhouse effect
• Draw images onto your greenhouse effect
diagram that will remind you of these ways
Effects of Climate Change in the
UK
• Likely to be WARMER
• More EXTREME WEATHER
• SEA LEVEL RISE flooding low lying areas
Good or bad?
Draw a table with 2 columns – positive and negative
effects. Copy the following points into the correct columns.
Summer drought and water shortages
More illnesses – sunstroke, skin cancer
Reduced winter heating costs
More land farmed at higher altitudes
Longer growing seasons – different crops like
grapes
Extinction of some plants and animals
Scotland’s ski resorts could be gone by 2050
Effects of Sea Level Change in the
Maldives
• http://www.bbc.co.uk/learningzone/clips/ris
ing-sea-levels-in-the-maldives/3192.html
• Watch the clip, write 5 facts.
Practice Question
• Using examples, explain why it is
important for people to prepare for climate
change.
(4 marks)
SELF ASSESSMENT:
Using examples, explain why it is important for people to
prepare for climate change.
(4 marks)
• 4 marks = 4 points (or 2, each explained)
• Eg It is important for people living by the coast
to be ready in case their house gets flooded by
rising seas. For example people living in the
Maldives may have to move to higher ground on
a larger island. It is important for farmers to
prepare for climate change as they may be able
to grow different crops, like peaches in the UK,
and so make more money.