Understanding Global Climate Change
Effects of Warming


The Intergovernmental Panel on Climate Change (IPCC) is the
United Nations body for assessing the science related to
climate change.

The IPCC prepares comprehensive Assessment Reports about the
state of scientific, technical and socio-economic knowledge on
climate change, its impacts and future risks, and options for
reducing the rate at which climate change is taking place. It
also produces Special Reports on topics agreed to by its
member governments, as well as Methodology Reports that
provide guidelines for the preparation of greenhouse gas
inventories. The IPCC is working on the Sixth Assessment
Report which consists of three Working Group contributions and
a Synthesis Report. The Working Group I contribution was
finalized in August 2021, the Working Group II contribution in
February 2022 and the Working Group III contribution in April

We are in deep trouble. (sigh)

IPCC Sixth Assessment Reports (AR6) (2021-2023) https://www.ipcc.ch/reports/ AR6 Climate Change 2021: The Physical Science Basis https://www.ipcc.ch/report/sixth-assessment-report-working-group-i/ <== AR6 Climate Change 2022: Mitigation of Climate Change https://www.ipcc.ch/report/sixth-assessment-report-working-group-3/ AR6 Climate Change 2022: Impacts, Adaptation and Vulnerability https://www.ipcc.ch/report/sixth-assessment-report-working-group-ii/ https://www.ipcc.ch/report/ar6/wg2/downloads/report/IPCC_AR6_WGII_SummaryForPolicymakers.pdf https://www.ipcc.ch/report/ar6/wg2/resources/spm-headline-statements/ Observed and Projected Impacts and Risks Beyond 2040 and depending on the level of global warming, climate change will lead to numerous risks to natural and human systems (high confidence). https://www.ipcc.ch/report/ar6/wg2/downloads/outreach/IPCC_AR6_WGII_FactSheet_NorthAmerica.pdf AR6 Synthesis Report: Climate Change 2023 https://www.ipcc.ch/report/sixth-assessment-report-cycle/ IPCC: Climate change: a threat to human wellbeing and health of the planet. Taking action now can secure our future https://www.ipcc.ch/2022/02/28/pr-wgii-ar6/ BERLIN, Feb 28 - Human-induced climate change is causing dangerous and widespread disruption in nature and affecting the lives of billions of people around the world, despite efforts to reduce the risks. People and ecosystems least able to cope are being hardest hit, said scientists in the latest Intergovernmental Panel on Climate Change (IPCC) report, released today. "This report is a dire warning about the consequences of inaction," said Hoesung Lee, Chair of the IPCC. "It shows that climate change is a grave and mounting threat to our wellbeing and a healthy planet. Our actions today will shape how people adapt and nature responds to increasing climate risks." The world faces unavoidable multiple climate hazards over the next two decades with global warming of 1.5°C (2.7°F). Even temporarily exceeding this warming level will result in additional severe impacts, some of which will be irreversible. Risks for society will increase, including to infrastructure and low-lying coastal settlements.

SOUNDING THE ALARM There is no Plan B for dealing with the climate crisis By Raymond T. Pierrehumbert, August 30, 2019 https://desdemonadespair.net/2019/09/there-is-no-plan-b-for-dealing-with-climate-change-with-regard-to-the-climate-crisis-yes-its-time-to-panic.html Let's get this on the table right away, without mincing words. With regard to the climate crisis, yes, it's time to panic. We are in deep trouble. To understand why, it is necessary to understand something about carbon budgets. Some of the carbon dioxide added to the atmosphere by human activities such as fossil fuel burning is quickly taken up by the upper ocean and land ecosystems. Some of the rest is slowly absorbed into the deep ocean over the next millennium. However, a lot remains in the atmosphere, and it is only slowly removed by geological processes that take hundreds of thousands of years. Consequently, carbon dioxide accumulates in the atmosphere throughout the lifetime of the fossil-fueled economy, and it will not drop much even after we finally kick the carbon habit and cease our carbon dioxide emissions. If CO2 Emissions Keep Up, Earth Is Headed Back to The Triassic Period -- Or Worse https://www.sciencealert.com/if-co2-emissions-keep-up-earth-is-headed-back-to-the-triassic-period-or-worse It's no secret that our planet is getting hotter due to heat-trapping carbon dioxide (CO2) emissions, but a new study suggests that current global warming trends could produce a climate not seen in almost half a billion years of Earth's history. Worried about Earth's future? Well, the outlook is worse than even scientists can grasp https://phys.org/news/2021-01-earth-future-outlook-worse-scientists.html Anyone with even a passing interest in the global environment knows all is not well. But just how bad is the situation? Our new paper shows the outlook for life on Earth is more dire than is generally understood. The research published today reviews more than 150 studies to produce a stark summary of the state of the natural world. We outline the likely future trends in biodiversity decline, mass extinction, climate disruption and planetary toxification. We clarify the gravity of the human predicament and provide a timely snapshot of the crises that must be addressed now. The exorbitant cost of climate procrastination https://phys.org/news/2019-02-exorbitant-climate-procrastination.html A 3°C warming would wreak havoc on the planet, justifying the absolute necessity of the +1.5°C limit. However, even a +1.5°C change would incur heavy consequences. The adaptation cost would undoubtedly be high both for current and future generations: loss of agricultural yields, sea-level rise, whole regions rendered uninhabitable, leading to massive flows of climate migrants, collapse of the ecosystems and impoverished biodiversity, extreme meteorological events, seashore and topsoil erosion... All these effects will grow even more dire as global warming proceeds." How climate change can make catastrophic weather systems linger for longer https://phys.org/news/2019-02-climate-catastrophic-weather-linger-longer.html There does seem to be a plausible link between human-induced warming, slowing of jet streams, blocking highs, and extreme weather around the world. There is also a trend for the slowing of the forward speed (as opposed to wind speed) of tropical cyclones around the world. One recent study showed the average forward speeds of tropical cyclones fell by 10% worldwide between 1949 and 2016. Meanwhile, over the same period, the forward speed of tropical cyclones dropped by 22% over land in the Australian region. The Fall of The Amazon Could Trigger a Global Cascade of Tipping Points https://www.sciencealert.com/the-fall-of-the-amazon-could-trigger-a-global-cascade-of-tipping-points If the Amazon crosses a critical threshold of self-resilience, a new study suggests the disaster could set off a domino effect, knocking over tipping points elsewhere in the world, too, abruptly accelerating environmental crises and causing irreparable damage to the planet. Tipping points in the global climate system, such as collapsing ice sheets, glacier melt, forest dieback, sea level rise, and shifting monsoons, have received a lot more attention in recent years. Each one of these switches could seriously turn up the heat on our planet, creating a 'hothouse Earth' with irreversible and catastrophic effects. They are all connected by the global greenhouse effect, but in a climate crisis, it's uncertain in what order they will ultimately fall.

ISU professor of Geological and Atmospheric Sciences Bill Gutowski - Global Climate Change 101 https://isualumblog.wordpress.com/2015/08/20/global-climate-change-101/ ISU professor of Geological and Atmospheric Sciences Eugene S. Takle (ISU) | Outreach Presentations https://meteor.geol.iastate.edu/faculty/takle/index.html

Fourth National Climate Assessment (NCA4), Volume I (2017) https://science2017.globalchange.gov Fourth National Climate Assessment (NCA4), Volume II (2018) https://nca2018.globalchange.gov The National Climate Assessment (NCA) assesses the science of climate change and variability and its impacts across the United States, now and throughout this century. Summary Findings These Summary Findings represent a high-level synthesis of the material in the underlying report. The findings consolidate Key Messages and supporting evidence from 16 national-level topic chapters, 10 regional chapters, and 2 chapters that focus on societal response strategies (mitigation and adaptation). Unless otherwise noted, qualitative statements regarding future conditions in these Summary Findings are broadly applicable across the range of different levels of future climate change and associated impacts considered in this report. sam.wormley@gmail.com