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Gathering Community Observations of Climate Change

Learn how to gather valuable information on past and current climate trends from local communities to complement scientific data. Use the tools in the CVCA Handbook to collect community observations effectively.

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Gathering Community Observations of Climate Change

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  1. To complement the scientific information gathered in the previous two steps, and to put it in the local context, it is important to also solicit community observations of climate change. Communities often have a wealth of information on past and current climate trends, including both data and perceptions. Tools in the CVCA Handbook will assist you in gathering this information from the communities. Careclimatechange.org

  2. Oluwakemi Izomo

  3. (Natural and Anthropogenic Hazards: Overview) (Natural Hazards) Trends The Challenge: Leaving the Holocene What does that mean for Sea Level? Hans-Peter Plag September 29, 2014

  4. Distinction between trends and hazardous events • Trends change the hazard spectrum: • can cause more frequent, more extreme hazards • can lead to new hazards or eliminate old ones

  5. Trends in the anthroposphere • political changes • economic changes • technological changes and revolutions

  6. Trends in the environment: • climate change and its consequences • global warming • sea level rise and ocean circulation • ocean chemistry • ecosystem impacts • crossing global boundaries (leaving the Holocene) • biodiversity • Nitrogen cycle • water cycle • land use • diseases and resistance

  7. The “global boundaries” of the “safe operating space for humanity” (Rockström et al., 2009) We are leaving the Holocene: Climate Change (***) Ocean acidification (**) Stratospheric ozone depletion (*) Nitrogen (******) and Phosphorous cycles (**) Global freshwater (*) Change in land use (*) Biodiversity loss (*******) Atmospheric aerosols (?) Chemical pollution (?) Climate change and sea level rise are symptoms, not the cause, not the “sickness.” We are pushing Earth out off the Holocene, our safe operating space ... We are in the middle of an “extinction-type event”, a planetary accident.

  8. Trends in the environment: • climate change and its consequences • global warming • sea level rise and ocean circulation • ocean chemistry • ecosystem impacts • crossing global boundaries (leaving the Holocene) • biodiversity • Nitrogen cycle • water cycle • land use • diseases and resistance

  9. IPCC, 2013

  10. Temperature, 1880-2012, 5 Year averages of anomaly compared to 1880-1885

  11. Sea surface height Sea surface height (not sea level): Wiggles of 1-2 cm over several years 1993-2010 minus 3.2 mm/yr Regional differences of more than 30 cm over 20 years steric height Meyssignac and Cazenave, 2012

  12. Heat content in the ocean: • Warming strongest around S. Ocean, where AABW is formed • Most warming statistically significant at 95% confidence • Deep warming (z > 2000 m) is 50 (±28) TW (about 1/4 of total global estimate!) (Purkey & Johnson, 2010)

  13. Population GDP CO2 CH4 1750 2000 Floods Temperature We are Reengineering the Planet ... Bill McKibben: Earth becomes Eaarth ... Cars Deforestation Extinction

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