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Prepared by 104 leading scientists the report summarises the observed physical changes that can be attributed to climate change to date. It cites 6,981 publications and incorporates feedback from 3,116 experts and governments in 80 countries. These are some of the observed physical changes, as outlined in the [Summary for Policymakers](https://www.ipcc.ch/srocc/chapter/summary-for-policymakers/): A1. Over the last decades, global warming has led to widespread shrinking of the cryosphere, with mass loss from ice sheets and glaciers (very high confidence), reductions in snow cover (high confidence) and Arctic sea ice extent and thickness (very high confidence), and increased permafrost temperature (very high confidence). A2. It is virtually certain that the global ocean has warmed unabated since 1970 and has taken up more than 90% of the excess heat in the climate system (high confidence). Since 1993, the rate of ocean warming has more than doubled (likely). Marine heatwaves have very likely doubled in frequency since 1982 and are increasing in intensity (very high confidence). By absorbing more CO2, the ocean has undergone increasing surface acidification (virtually certain). A loss of oxygen has occurred from the surface to 1000 m (medium confidence). A3. Global mean sea level (GMSL) is rising, with acceleration in recent decades due to increasing rates of ice loss from the Greenland and Antarctic ice sheets (very high confidence), as well as continued glacier mass loss and ocean thermal expansion. Increases in tropical cyclone winds and rainfall, and increases in extreme waves, combined with relative sea level rise, exacerbate extreme sea level events and coastal hazards (high confidence). ![](https://static.hsstatic.net/BlogImporterAssetsUI/ex/missing-image.png) Source: IPCC Summary for Policymakers https://www.ipcc.ch/srocc/chapter/summary-for-policymakers/ A4. Cryospheric and associated hydrological changes have impacted terrestrial and freshwater species and ecosystems in high mountain and polar regions through the appearance of land previously covered by ice, changes in snow cover, and thawing permafrost. These changes have contributed to changing the seasonal activities, abundance and distribution of ecologically, culturally, and economically important plant and animal species, ecological disturbances, and ecosystem functioning (high confidence). A5. Since about 1950 many marine species across various groups have undergone shifts in geographical range and seasonal activities in response to ocean warming, sea ice change and biogeochemical changes, such as oxygen loss to their habitats (high confidence). This has resulted in shifts in species composition, abundance and biomass production of ecosystems, from the equator to the poles. Altered interactions between species have caused cascading impacts on ecosystem structure and functioning (medium confidence). In some marine ecosystems, species are impacted by both the effects of fishing and climate changes (medium confidence). A6. Coastal ecosystems are affected by ocean warming, including intensified marine heatwaves, acidification, loss of oxygen, salinity intrusion and sea level rise, in combination with adverse effects from human activities on ocean and land (high confidence). Impacts are already observed on habitat area and biodiversity, as well as ecosystem functioning and services (high confidence). A7. Since the mid-20th century, the shrinking cryosphere in the Arctic and high-mountain areas has led to predominantly negative impacts on food security, water resources, water quality, livelihoods, health and well-being, infrastructure, transportation, tourism and recreation, as well as culture of human societies, particularly for Indigenous peoples (high confidence). Costs and benefits have been unequally distributed across populations and regions. Adaptation efforts have benefited from the inclusion of Indigenous knowledge and local knowledge (high confidence). A8. Changes in the ocean have impacted marine ecosystems and ecosystem services with regionally diverse outcomes, challenging their governance (high confidence). Both positive and negative impacts result for food security through fisheries (medium confidence), local cultures and livelihoods (medium confidence), and tourism and recreation (medium confidence). The impacts on ecosystem services have negative consequences for health and well-being (medium confidence), and for Indigenous peoples and local communities dependent on fisheries (high confidence). A9. Coastal communities are exposed to multiple climate-related hazards, including tropical cyclones, extreme sea levels and flooding, marine heatwaves, sea ice loss, and permafrost thaw (high confidence). A diversity of responses has been implemented worldwide, mostly after extreme events, but also some in anticipation of future sea level rise, e.g. in the case of large infrastructure. *This article is from the AWA Sustainable Development Goals Specialist Network’s April 2020 newsletter. To join the SDG network please add us to your member profile. Other articles from the April newsletter can be read via the links below.* [Australia as a whole has been flatlining on SDG 13](https://ozwater.org/Watersource/environment/natural-environment/australia-as-a-whole-has-been-flatlining-on-climate-action-sdg) [Victoria’s Zero Emissions Water initiative](https://ozwater.org/Watersource/business/partnerships/victorias-zero-emissions-water-initiative) [Blue carbon ecosystems can help meet SDG 13](https://ozwater.org/Watersource/environment/natural-environment/blue-carbon-ecosystems-can-help-meet-sdg-13) [Meeting SDG 6 and SDG 13 targets together](https://ozwater.org/Watersource/business/assets-and-operations/meeting-sdg-6-and-13-targets-together) [ Sustainable Development Goals Specialist Network ](https://www.awa.asn.au/resources/latest-news/tag/sustainable-development-goals-specialist-network) [ AWA Specialist Networks ](https://www.awa.asn.au/resources/latest-news/tag/awa-specialist-networks) [ Climate Change ](https://www.awa.asn.au/resources/latest-news/tag/climate-change) [ sea level rise ](https://www.awa.asn.au/resources/latest-news/tag/sea-level-rise) [ Extreme Weather ](https://www.awa.asn.au/resources/latest-news/tag/extreme-weather) [ Water Security ](https://www.awa.asn.au/resources/latest-news/tag/water-security) [ Natural Environment ](https://www.awa.asn.au/resources/latest-news/tag/natural-environment) Share [![email icon](https://www.awa.asn.au/hubfs/website-assets-2021/icons/icon-dark-sandstone-email.svg "email icon") ](mailto:?subject=IPCC%20report%20provides%20evidence%20in%20support%20of%20climate%20action&body=Check%20out%20https://www.awa.asn.au/resources/latest-news/environment/natural-environment/ipcc-report-evidence-support-climate-action) [![facebook-icon](https://www.awa.asn.au/hubfs/website-assets-2021/icons/icon-dark-sandstone-facebook.svg "facebook icon") ](https://www.facebook.com/sharer/sharer.php?u=https://www.awa.asn.au/resources/latest-news/environment/natural-environment/ipcc-report-evidence-support-climate-action) [![LinkedIn icon](https://www.awa.asn.au/hubfs/website-assets-2021/icons/icon-dark-sandstone-linkedin.svg "LinkedIn icon") ](https://www.linkedin.com/shareArticle?mini=true&url=https://www.awa.asn.au/resources/latest-news/environment/natural-environment/ipcc-report-evidence-support-climate-action) [![Twitter icon](https://www.awa.asn.au/hubfs/website-assets-2021/icons/icon-dark-sandstone-twitter.svg "Twitter icon") ](https://twitter.com/home?status=https://www.awa.asn.au/resources/latest-news/environment/natural-environment/ipcc-report-evidence-support-climate-action) ## RELATED NEWS [![](https://www.awa.asn.au/hs-fs/hubfs/WWW.png?width=352&name=WWW.png) ](https://www.awa.asn.au/resources/latest-news/catchments-and-climate-resilience-unlocking-the-governance-opportunity) ### [ Catchments and climate resilience: unlocking the governance opportunity ](https://www.awa.asn.au/resources/latest-news/catchments-and-climate-resilience-unlocking-the-governance-opportunity) Cecilia Harris Healthy catchments are vital for climate resilience – and effective governance is key. As extreme weather intensifies, integrated… [ Read Full Paper ](https://www.awa.asn.au/resources/latest-news/catchments-and-climate-resilience-unlocking-the-governance-opportunity) [![](https://www.awa.asn.au/hs-fs/hubfs/illustration-2023-united-nations-climate-600nw-2383787099.webp?width=352&name=illustration-2023-united-nations-climate-600nw-2383787099.webp) ](https://www.awa.asn.au/resources/latest-news/cop28-putting-water-women-and-indigenous-knowledge-on-the-agenda) ### [ COP28: putting water, women and Indigenous Knowledge on the agenda ](https://www.awa.asn.au/resources/latest-news/cop28-putting-water-women-and-indigenous-knowledge-on-the-agenda) Water Source The annual United Nations Climate Change Conference brings together international leaders, organisations and researchers to… [ Read Full Paper ](https://www.awa.asn.au/resources/latest-news/cop28-putting-water-women-and-indigenous-knowledge-on-the-agenda) ### [ Could palaeoclimate data be the key to climate change adaptation? ](https://www.awa.asn.au/resources/latest-news/environment/natural-environment/could-palaeoclimate-data-be-the-key-to-climate-change-adaptation) Water Source While some climate data allows us to gauge the likelihood of future extreme weather events, climate change is altering our… [ Read Full Paper ](https://www.awa.asn.au/resources/latest-news/environment/natural-environment/could-palaeoclimate-data-be-the-key-to-climate-change-adaptation) Advertising --- ### Subscribe to our newsletters Sign up to get the latest news and insights from us Advertising --- ![white arrow pointing upwards](https://www.awa.asn.au/hubfs/website-assets-2021/icons/awa-white-arrow-up.svg) Top [![Footer-logo-02](https://www.awa.asn.au/hubfs/Footer-logo-02.svg) ](https://www.awa.asn.au/) The **Australian Water Association** acknowledges the Traditional Custodians across Australia, where we live, work and play, for their deep connection to our precious waters and land. 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