Start-Up: The hole in the ozone layer does not cause global warming. In fact, the hole in the ozone layer slows down global warming. Why is this a misconception some people have?
Greenhouse effect Greenhouse gases in the atmosphere trap heat that would otherwise be reflected back into space This is a natural process! Life on earth cannot exist without it!
Greenhouse gases: water vapor, carbon dioxide, ozone, methane
VENUS Extreme greenhouse effect!
Carbon cycle Process by which carbon moves from inorganic to organic compounds and back Matter and energy are not created nor destroyed! They are only converted from one form to another!
Humans have caused an increase in the amount of carbon released into the atmosphere Fossil fuels burned to run cars and trucks, heat homes and businesses, and power factories are responsible for about 98% of U.S. carbon dioxide emissions
Compare the increase in CO 2 output with this…
Monthly changes in atmospheric CO 2 concentration
6CO 2 +6H 2 O C 6 H 12 O 6 + 6O 2 Photosynthesis Trees act like carbon “sinks”, absorbing carbon from the atmosphere
Because trees are carbon “sinks”, when you cut them down, all the carbon they have absorbed get released into the environment
Without Human Activities Non-human events do not account for the trend
With Human Activities Both human and non-human events together account for the trend
What will the increasing level of carbon dioxide (a greenhouse gas) do to the greenhouse effect?
Predictions Differences are due to natural variability and human choices
Climate Change on the Antarctic Peninsula
Antarctica is in the southern hemisphere, so the timing of the seasons is the
opposite of what we experience in North America.
(2) Because most of the Antarctic continent is covered by a permanent ice sheet, terrestrial habitat for sea birds is limited to the coastline and small islands.
(3) The western Antarctic Peninsula has a maritime climate, and therefore
is warmer on average than the rest of the Antarctic continent.