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Slides for Climate change discussion
22nd May For Supper Club Gerald Oakham, Peter Black
Slides for Climate change discussion 22 nd May For Supper Club - - PowerPoint PPT Presentation
Slides for Climate change discussion 22 nd May For Supper Club - - PowerPoint PPT Presentation
Slides for Climate change discussion 22 nd May For Supper Club Gerald Oakham, Peter Black Section A What is Global Warming Historical global temperatures Temperature record reconstructed by looking at, ice cores, fossil
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”Historical” global temperatures
- Temperature record
reconstructed by looking at, ice cores, fossil composition, tree ring growth etc.
- Note smooth
temperature variations over past 2000 years with sudden increase in past century
Plot taken from Wikipedia, Global Temperature Record
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Global temperatures since industrial revolution (Based on temperature measurements)
From IPCC Figure 2.1 SR1.5 Chapter 1
Global Temperatures have risen 1 degree in the past 150 years. Note Global temperature is average of many readings
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Comparison of CO2 and temperature changes
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Pr Projected te temperat ature rises for dif different t scenar nario ios
No Note blue scenari rio re require res both re reduction in in GHG GHG emis emissio ions an and Ca Carbon c capture.
From IPCC AR5 report
Scenarios:- Blue – optimistic action to reduce GHG emissions Red – little action to reduce GHG emissions (GHG – Green House Gases)
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Average projected temperature rises for Canada Blue optimistic Red - Pessimistic
From Canada’s Changing Climate report (2019)
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Average Canadian temperatures have increased 1.7 degrees between 1948 and 2016. Increase in the north is higher– 2.3 degrees!
From Canada’s Changing Climate report (2019)
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Pr Projected changes in in pr precipit ipitatio tion
Large increase in the Arctic Moderate increase Northern Ontario Small increases in Ottawa
From Canada’s Changing Climate report (2019)
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Section B What and who is causing Global Warming
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Canadian Green House Gas emissions
Graphic from Rolly Montpellier www.Below2C.Org
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Section C: What harm has Global warming already caused. What will be the impact of 2 C of global Warming
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Accumulated Cyclone energy (ACE) For Atlantic basin
The power of cyclones in a given year is higher in the past 20 years than the past 70.
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Section D: Responses to Global Warming – mitigation – Government action
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Plot from IPCC 1.5 report
The Paris Agreement’s central aim is to strengthen the global response to the threat of climate change by keeping a global temperature rise this century well below 2 degrees Celsius above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5 degrees Celsius. Any plan to keep warming below 1.5 degrees requires both GHG control and removing CO2 from the atmosphere
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100 200 300 400 500 600 700 800
1990 2000 2010 2020 2030 2040
Canada's green house gas emissions (Gigatons) for selected years
Paris Target for Canada IPCC 1.5 Target for Canada
Year
Year GHC Notes Gigatons 1992 620 2005 730 2010 700 2015 720 2030 524 Paris Target 2030 385 IPCC 1.5 Target
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Canada’s Green House Gas emissions
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Section E, F, G, H: Response to global warming – personal action
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Section H: Response to global warming - adaptation
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