3.A - why is there a debate on climate change? Flashcards
the history of the global warming debate - 1820s
- greenhouse effect discovered by french physicist Joseph Fourier
the history of the global warming debate - 1862
- John Tyndall suggested certain gases
- like water vapour and CO2
- trapped heat escaping from the earth’s atmosphere
the history of the global warming debate - 1896
- swedish scientist Svente Arrhenius observed that CO2 is an absorber of long wave radiation emitted by earth
- also showed that a doubling of CO2 = increased avg. global temps by 5-6C
the history of the global warming debate - 1938
- discussion lasted for several decades
- until Guy Callender linked global warming to emissions of CO2 from burning fossil fuels
- at time there was little interest in his assertion
- as people believed excess CO2 would be absorbed by oceans
the history of the global warming debate - 1957
- this view changed dramatically = Hans Suess and Roger Revelle
- discovered a complex chemical process which limited the capacity of oceans to absorb CO2
- this mean that the residence time of CO2 in the atmosphere was much longer than previously thought
the history of the global warming debate - 1958
- accurate measurements of global atmospheric CO2
- database provided incontrivertible proof that CO2 conc in atmosphere is increasing
- trend known as the Keeling curve
- atmospheric CO2 is at highest level for 700,000 yrs
the history of the global warming debate - 1970
- debate continued
- satellite imagery and computer modelling advanced, revealing that human activites were main cause
the history of the global warming debate - 1988
- IPCC set up international panel on climate change
what is Greta Thunberg’s role in the climate change debate?
- act as a voice for young people
- fuel the debate and get young people to change
what 5 pieces of evidence are in favour of the idea of humans warming our climate (warmists)?
- the 2010 Anderegg study found that 98% of climate researchers publishing most actively in their field agree that human activity is primarily responsible for global climate change
- dramatic changes in precipitation, such as heavier storms and less snow, are another sign that humans are causing climate change
- rising levels of human produced gases released into the atmosphere create a greenhouse effect that traps heat and causes global warming
- avg temperatures on earth have increased at a rate far faster than can be explained by the models of natural climatic factors alone
- about a quarter of the globe’s glacial loss from 1851-2010, and approximately 2/3 of glacial loss between 1991-2010 is attributable directl yto global warming caused by human-produced GHGs.
how many climate researchers believe climate change is human caused?
the 2010 Anderegg study found that 98% of climate researchers publishing most actively in their field agree that human activity is primarily responsible for global climate change
how do weather changes indicate that humans are at fault for climate change?
dramatic changes in precipitation, such as heavier storms and less snow, are another sign that humans are causing climate change
how do rising levels of GHGs indicate that humans are at fault for climate change?
rising levels of human produced gases released into the atmosphere create a greenhouse effect that traps heat and causes global warming
how do rising temps indicate that humans are at fault for climate change?
avg temperatures on earth have increased at a rate far faster than can be explained by the models of natural climatic factors alone
how does glacial loss indicate that humans are at fault for climate change?
about a quarter of the globe’s glacial loss from 1851-2010, and approximately 2/3 of glacial loss between 1991-2010 is attributable directl yto global warming caused by human-produced GHGs.
what 5 pieces of evidence are against the idea of humans warming our climate?
- in 2010 Cliamte Depot released a report featuring more than 1000 scientists, several of them former UN IPCC scientists, who disagreed that humans are primarily responsible for global climate change. changes in solar and volcanic activity are often cited as being contributors
- earth’s climate has always warmed and cooled, and the 20th century rise in global temperature is w/in the bounds of natural temp fluctuations over the past 3000 yrs
- CO2 is already saturated in earth’s atmosphere, and more CO2, manamde or natural, will have little impact on climate
- the IPCC predicted that Himalayan glaciers would likely melt away by 2035, a prediction they disavowed in 2010. in 2014 a study of 2181 himalayan glaciers from 2000-2011 showed that 86.6% of the glaciers were not receeding
- increased hurrican activity and other extreme weather events are a result of natural weather patterns, not human caused climate change.
how did the Climate Depot suggest that climate change is natural?
- in 2010 Cliamte Depot released a report featuring more than 1000 scientists, several of them former UN IPCC scientists, who disagreed that humans are primarily responsible for global climate change.
- changes in solar and volcanic activity are often cited as being contributors
how does the earth’s climate suggest that climate change is natural?
earth’s climate has always warmed and cooled, and the 20th century rise in global temperature is w/in the bounds of natural temp fluctuations over the past 3000 yrs
how does CO2 saturation suggest that climate change is natural?
CO2 is already saturated in earth’s atmosphere, and more CO2, manamde or natural, will have little impact on climate
how do the IPCC suggest that climate change is natural?
the IPCC predicted that Himalayan glaciers would likely melt away by 2035, a prediction they disavowed in 2010. in 2014 a study of 2181 himalayan glaciers from 2000-2011 showed that 86.6% of the glaciers were not receeding
how does extreme weather suggest that climate change is natural?
increased hurrican activity and other extreme weather events are a result of natural weather patterns, not human caused climate change.
how is the UN a part of the climate change debate?
- the UN is an international organisation set up in 1945 and made up of 193 member states with the key aim of promoting international cooperation
- the UN has created a Framework Convention on Climate Change (UNFCCC).
- initially this met in RIo de Janeiro in 1992 then Kyoto in 1997
how is the kyoto protocol important?
- the kyoto protocol is especially important as it set legally binding targets for countries to reduce their emissions
- there were 92 initially party to the Kyoto protocol
- although Australia and the USA didn’t ratify the treaty
what did the Kyoto protocol involve?
- during Kyoto protocol legally binding targets were set for 37 industrialised countries and the EU member states to reduce emissions of GHG by an average of 5% below their 1990 levels by 2012
- this first phase entered into force (after much discussion) in 2005
- during a second commitment period (2013-2020), parties committed to reduce GHG emissions by at least 18% below 1990 levels in the 8yr period
- however the composition of parties in the second committment period is different from the first, with Canada, Japan and Russia pulling out
what are the 3 main mechanisms set during the Kyoto protocol?
- international emissions trading (carbon credits)
- clean development mechanisms - projects in developing nations
- joint implementation - covers projects in mostly NICs
what was actually agreed at COP26 - kyoto protocol
- the legally binding protocol demands an avgd 5% cut in GHG emissions from the industrialised world as a whole by 2012
- each country has been set its own individual targets based on its pollution levels
- growing/developing countries are outside the framework
- even for countries that agreed to sign up, meeting the goals could be difficult
- canada has no clear plan for reaching targets (its emissions have increased by 20% since 1990)