Abstract
We are now at “code red” on planet Earth. Humanity is unequivocally facing a climate emergency. The scale of untold human suffering, already immense, is rapidly growing with the escalating number of climate-related disasters. Therefore, we urge scientists, citizens, and world leaders to read this Special Report and quickly take the necessary actions to avoid the worst effects of climate change.
Generated Summary
This Special Report, published in BioScience, provides a comprehensive overview of the escalating climate emergency, emphasizing the urgent need for action to mitigate its worst effects. The report, marking the 30th anniversary of the “World Scientists’ Warning to Humanity,” assesses recent climate-related disasters, analyzes planetary vital signs, and proposes policy recommendations. The study employs a multifaceted approach, including the tracking of climate-related disasters, an evaluation of planetary vital signs such as greenhouse gas concentrations and temperature anomalies, and an assessment of economic and policy-related factors. The methodology encompasses an analysis of extreme weather events, impacts on ecosystems, and the role of human activities in driving climate change. The scope of the report extends to examining the consequences of global heating, the impacts of climate-related disasters, and the need for transformative changes in various sectors to address the climate crisis. The study relies on data from various sources, including scientific literature, governmental reports, and environmental organizations, to provide a comprehensive and up-to-date assessment of the climate emergency and its implications.
Key Findings & Statistics
- Greenhouse Gas Emissions: The report notes a roughly 40% increase in global greenhouse gas emissions since the original 1992 warning.
- Temperature Increase: Current policies are projected to lead to approximately 3 degrees Celsius warming by 2100, a level not experienced in the past 3 million years.
- Carbon Dioxide Concentration: In March 2022, the concentration of carbon dioxide reached 418 parts per million, the highest monthly global average ever recorded.
- Extreme Heat Events: The number of extremely hot days has nearly doubled since 1980.
- Mortality: Roughly 500,000 deaths occurred between 2000 and 2019 that were heat related. The heat-related excess death ratio rose significantly from 2000-2003 to 2016-2019.
- Fossil Fuel Subsidies: Direct fossil fuel subsidies increased to US$440 billion in 2021, a rise from levels below US$200 billion.
- Carbon Pricing: The global emissions-weighted average price per tonne of carbon dioxide was approximately US$14.20 as of 2022.
- Carbon Bombs: There are currently 425 “carbon bombs”—existing or planned fossil fuel extraction projects with at least 1 gigaton of potential carbon dioxide emissions.
- Droughts: The number of people affected by drought in Kenya, Somalia, and Ethiopia who have limited access to safe water increased from 9.5 million to 16.2 million.
- Flooding: Deadly floods in Pakistan killed more than 1,000 people and affected roughly 33 million people, including 16 million children, since mid-June.
- Wildfires: Global wildfire activity appears to be exhibiting a rapid increase since 2009.
- Energy Consumption: Although solar and wind power consumption increased by roughly 18% between 2020 and 2021, it is still approximately 18 times lower than fossil fuel consumption.
Other Important Findings
- Climate-Related Disasters: The frequency and intensity of severe weather events have increased globally, including heat waves, floods, droughts, and wildfires.
- Arctic Warming: Rapid Arctic warming may affect the jet stream, leading to extreme weather events in the Northern Hemisphere.
- Extreme Risks: The report highlights the potential for extreme risks such as simultaneous global failure of crop yields across multiple major food-producing regions.
- Disproportionate Impacts: Climate-related disasters disproportionately harm poor people in low-income regions with minimal contributions to greenhouse gas emissions.
- Planetary Vital Signs: The report provides an update on planetary vital signs, including trends in temperature, greenhouse gas concentrations, and sea levels.
- Economic Trends: The report notes a strong increase in global fossil fuel divestment in 2022, while also highlighting the increase in direct fossil fuel subsidies.
- Energy Transition: There is an urgent need to immediately cease new fossil fuel development and reduce emissions, while solar and wind power consumption is increasing.
- Climate Impacts on Health: Climate change is linked to increases in the frequency and intensity of extreme heat events, with significant impacts on human health.
- Climate Policy: The report emphasizes the need for immediate mitigation and adaptation, including protecting nature, reducing fossil fuel emissions, and exploring carbon dioxide removal strategies.
- Call to Action: The authors call on scientists to speak out on climate and other environmental issues and suggest that peaceful civil disobedience by scientists may be needed.
Limitations Noted in the Document
- Data Availability: The report acknowledges that some climate-related disasters may be at least partly related to changes in jet streams, which introduces a degree of uncertainty.
- Model Limitations: The report mentions that preliminary models indicate a threshold response in the United States for wildfires and inland floods, but these are preliminary and subject to change.
- Simplification of Complex Issues: The report provides a high-level overview and summary of complex scientific findings, potentially oversimplifying some aspects of climate change and its impacts.
- Focus on Recent Events: The report primarily focuses on recent climate disasters, and while it provides context, it may not fully capture the long-term trends and historical perspectives.
- Attribution Challenges: The report acknowledges that although climate change is linked to various events, the exact degree of influence is difficult to ascertain.
Conclusion
The “World Scientists’ Warning of a Climate Emergency 2022” underscores the critical state of the planet and the urgent need for global action to combat climate change. The authors emphasize that humanity is unequivocally facing a climate emergency, with increasing extreme weather events and devastating consequences. The report highlights the critical role of scientists in speaking out on climate and other environmental issues, and calls for immediate mitigation and adaptation measures. The authors stress that current policies are insufficient and that transformative changes are needed to avoid the worst effects of climate change. The report emphasizes the need to reduce greenhouse gas emissions, transition to sustainable energy sources, and address ecological overshoot. The authors advocate for a range of policy measures, including reducing overconsumption, stabilizing the human population, and implementing sustainable ecological economics. They also suggest exploring carbon dioxide removal strategies and providing funding to support climate adaptation and compensate for climate-related losses. The report concludes with a call to action for scientists, citizens, and world leaders to take decisive steps to address the climate crisis, emphasizing that the very future of humanity depends on the choices made today. The authors urge that we must equitably reduce ecological overshoot, immediately pursue massive-scale climate change mitigation and adaptation. This is the only way we can limit the near-term damage, preserve nature, avoid untold human suffering, and give future generations the opportunities they deserve.