TeacherTECH - January 24, 2006 Notes to accompany the
presentation. Please note that some of the information and
comments within these notes are not necessarily the views of
experts, but are limited to my own general observations about
the subject. Topic Summary and Key Concepts Global warming and
how it relates to life Global climate is warming overall because
of the great amount of greenhouse gases (GHGs) that people have
added to the atmosphere. When people first harnessed fire and
began burning carbon-based fuels like wood and oil, they must
have intended to improve the quality of their lives rather than
to intentionally cause harmful climate change. As this activity
continues in a big way, it is now causing climate to change in
undesirable ways that run counter to our intentions to make our
lives better. Some GHG is normal in the atmosphere, but it is
now significantly elevated by the cumulative activity of a great
number of people. GHGs include carbon dioxide, methane, water
vapor, nitrous oxide and chl