Announcements!! Exam #2 next Friday (the 16 th ) Same deal as last time… Non- memory calculators OK. Please sit in dark seats Exams will be handed out at the door (at 8:35) Periodic Table will be attached…
Topics for Today What can we do about the ozone hole (or, what have we done)? Quiz #6!!
The ozone layer can only return to its 1970s status if all nations join in the effort to eliminate the emission of ozone- depleting substances into the atmosphere. Failure to ratify the ozone treaties may hinder international efforts to protect the earth from the damage caused by ozone- layer depletion. While such damage will have a global impact, developing countries are likely to be the most severely affected. http://ozone.unep.org/Treaties_and_Ratification/Montreal_Protocol/2Biv_becoming%20a%20 party%20montreal%20protocol.shtml
Early 1970s… Banned the use of “non-essential” CFCs in 1978. A few countries joined in (Canada and Sweden), but this was still NOT an international issue.
The Vienna Convention 1985 “The International community legitimized stratospheric ozone depletion as an international issue.” PETER M. MORRISETTE – Columbia college
Montreal Protocol 1987 International Meeting (24 countries attended)! Agreed to work together to limit CFC use and emissions We won’t go into the details here…
By 1989, 36 countries ratified the Protocol What exactly did the Protocol call for?
By 1989, 36 countries ratified the protocol How many countries have ratified it today?
By 1989, 36 countries ratified the protocol "Perhaps the single most successful international agreement to date...". Kofi Annan For the developed countries, the protocol stipulates that the production and consumption of Group I compounds are to be frozen at 1986 levels beginning in 1989. Production and consumption of Group I compounds must be reduced to 80 percent of 1986 levels by 1994, and 50 percent of 1986 levels by 1999.
“At present, 191 nations have become party to the Montreal Protocol. Those 5 that are not as of November 2006 are Andorra, Iraq, San Marino, Timor-Leste and Vatican City.”
4/7/06 - Fiji To Sign And Ratify Amendments to the Montreal Protocol
One reason that the Montreal Protocol was so successful…
1985 Vienna 1987 Montreal 1990 London 1992 Copenhagen 1995 Vienna 1997 Montreal 1999 Beijing 2003 Nairobi 2004 Prague 2005 Dakar, Senegal PERSISTANCE!!
The Montreal Protocol on Substances that Deplete the Ozone Layer as adjusted and/or amended in London 1990 Copenhagen 1992 Vienna 1995 Montreal 1997 Beijing 1999 UNEP Ozone Secretariat United Nations Environment Programme The details (FYI)
As of 19 February 2007, the status of ratification is as follows: Ratification of: Vienna Conventi on Montreal Protocol London Amendm ent Copenhagen Amendment Montreal Amendme nt Beijing Amendm ent Total number of countries 191 185176152124 http://ozone.unep.org/Ratification_status/http://ozone.unep.org/Ratification_status/ Accessed March 7, 2007
"Perhaps the single most successful international agreement to date...". Kofi Annan
Has the Montreal Protocol been successful? "Perhaps the single most successful international agreement to date...". Kofi Annan Let’s look at the data…
A paper on the subject involving researchers from CU-Boulder, NOAA, the University of Wisconsin Madison, the University of Chicago and the University of Illinois the team documented a leveling off of declining ozone levels between 1996 and 2002, and even measured small increases in some regions.
H Cl H Cl | | | | H – C – C – Cl H – C – C – Cl | | | | H F HCFC-141b H F HCFC-141b1,1-chloro-1-fluoroethane HCFCs (hydrochlorofluorocarbons) Atmospheric life-time of about 10 years! Why is this so different from CFCs?
H Cl H Cl | | | | H – C – C – Cl H – C – C – Cl | | | | H F HCFC-141b H F HCFC-141b1,1-chloro-1-fluoroethane HCFCs (hydrochlorofluorocarbons) Results in lower ability to deplete ozone
“Researchers are making progress in perfecting automotive and portable air-conditioning systems that use environmentally friendly carbon dioxide as a refrigerant instead of conventional, synthetic global- warming and ozone-depleting chemicals.”
Why CO 2 ? Easy to get… It is in the atmosphere already It does not deplete ozone
“Toyota Motor Corporation a claimed world- first non-fluorocarbon car air conditioner using natural refrigerant, carbon dioxide (CO 2 ).” Dec 2002