Society in Question (SIQ) Notes: Sociology 1A06 – Prof Colavecchia McMaster University
Sociology & the Environment: “Climate Changes in Climate and their Effects” - Chapter 26 SIQ
Synthesis report = assessment carried out by the 3 Working Groups of the
Intergovernmental Panel on Climate Change (IPCC). Provides view of climate change.
11/12 years from 1995-2006 rank among the 12 warmest years in the instrumental
record of global surface temperature since 1850.
Temperature increase is greater at higher Northern latitudes.
Land regions warmed faster than oceans.
Rising sea level. 1961=1.8 mm/yr 1993=3.1 mm/yr. from melting glaciers and ice caps
and polar ice sheets.
Decreases in snow and ice extent consistent are also with warming. Shrunk by 2.7% per
decade. Mountain glaciers and snow cover have declined in both hemispheres.
1900-2005=precipitation increased in Eastern parts of North & South America, and Asia
and declined in the Sahel, Mediterranean, Southern Africa, and parts of southern Asia.
Globally, the area affected by drought has likely increased since the 1970s.
Over past 50 years, coldness has become less frequent and hotness more frequent.
Heat waves, heavy precipitation and rising sea levels increasing since 1975.
Greenhouse gases (GHSs) and aerosols, land cover and solar radiation alter the energy
balance of the climate system. Carbon Dioxide = human caused (agriculture and fossil
fuel use). Grew by 80% between 1970-2004.
Observed patterns of warming and their changes are stimulated only by models that
include anthropogenic forcings.
Human infthences have very likely contributed to sea level rise during the latter half of
the 20 century, likely