An issue of global concern!
Global
warming
Assessment
There will be a series of lessons over the next
2-3 weeks, where we will investigate global
warming and the green house effect.
The assessment will be in the form an essay
which will be no more than 4 A4 sides.This
must be completed during lessons, however
you are able to research at home and then
bring it in.
This will count for 10% of your GCSE grade!
Assessment
1.What is the difference between
inhanced warming and natural warming?
2.Who is in favour of trying to control this
warming, and why?
Who is against trying to control this
warming and why?
Assessment
• 3. What do I think? Justify with evidence.
• 4. What could be done as an individual?
Assessment
• You will then have 2 lessons to piece
together this information in the form of an
essay. It will be a maximum of 4 A4 sides
and must be completed in class. Your
essay may be typed up at home but a draft
written copy must be shown to me first.
• You will be given a brief concerning what
will be required.
Learning objectives
You will be able to:
• Define the term “ Global warming”.
• Understand the how the “Greenhouse
effect” works.
What do I know
about global warming?
Global Warming 101
http://uk.youtube.com/watch?v=oJAbATJCu
gs
What is global warming and how
is it caused?
Global warming is the increase in
the average temperature of the
Earth's near-surface air and oceans.
Increasing global temperatures will cause sea levels to
rise and will change the amount and pattern of
precipitation across the earth. Other likely effects
include increases in the intensity of extreme weather
events, changes in agricultural yields, modifications of
trade routes, glacier retreat, species extinctions and
increases in disease.
Ladies swimwear through the
ages!
Recent global temperature
variations
Draw this!!
The Greenhouse effect
1.
2.
3.
4.
5.
Solar radiation passes through the clear atmosphere.
Some solar radiation is reflected by the atmosphere and the
earths surface.
Some of the infrared radiation passes through the atmosphere
and is lost to space.
Some of the infrared radiation is absorbed and re-emmitted by the
green house gas molecules. The direct effect is the warming of
the earth’s surface and its troposphere.
Some energy is absorbed by the earth’s surface and warms it,
converting it to heat causing the emmission of long wave radiation
(infrared) back in to the atmosphere.
The Greenhouse summary
•
Greenhouse gases, which include water vapor,
carbon dioxide and methane, warm the
atmosphere by efficiently absorbing thermal
infrared radiation emitted by the Earth’s surface.
•
As a result of its warmth, the atmosphere also
radiates thermal infrared in all directions, including
downward to the Earth’s surface.
•
Thus, greenhouse gases trap heat within the
surface-troposphere system. As concentrations of
greenhouse gasses increase, so does the earth’s
average temperature.
Carbon Dioxide against Global
average temperature
Task: Describe the relationship
between the two variables.
Questions
Read through page 61
“Geography for Avery Hill”.
Study source C. Answer question 3.
http://www.climatehotmap.org/index
.html
• Global warming: Early warning signs.