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Media Construction of Global Warming

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Media Construction of Global Warming Lesson 2 Global Warming: Fact or Myth? Are recent trends in global temperature unprecedented in our climatic history? – PowerPoint PPT presentation

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Title: Media Construction of Global Warming


1
Media Construction of Global Warming Lesson 2
Global Warming Fact or Myth?
2
Are recent trends in global temperature
unprecedented in our climatic history?
3
How do we know whom to believe when scientists
disagree on the answers to highly technical and
potentially cataclysmic questions?
4
Two ice core records created by independent
research teams from different sites in
Antarctica.
5
Surface air temperature and its changes over the
past 150 years based on compiled surface
temperature measurements.
6
Arctic temperature proxies for 1600-1990 from a
compilation of paleoclimate records from lake
sediments, tree rings, glacier ice cores, and
marine sediments.
7
Temperature-sensitive paleoclimatic multi-proxy
data from 17 sites worldwide. Proxy sources
include tree rings, ice cores, corals, and
historical documents.
8
Reconstruction based on multiple tree ring and
ice core data sets.
9
Temperature variations from a northern tree-ring
density network.
10
Proxy data used tree-rings, ice cores, and
historical documents.
11
Graph showing six different temperature
reconstructions based on a variety of proxy data
sources, with observed temperature averages
(through direct measurement) on the same set of
axes.
12
The Hockey Stick Curve
The year-by-year (blue curve) and 50-year average
(black curve) variations of the average surface
temperature of the Northern Hemisphere for the
past 1,000 years.
(From IPCCs Third Assessment Report)
13
Global Warming The current and unprecedented
rise in the Earths temperature.
14
Is global warming a fact or a myth?
15
Media Construction of Global Warming Lesson
2 Global Warming Fact or Myth?
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