Articles Posted in Reports

The American Meteorological Society issued its annual report recently on the state of the climate for 2019. The report notes increases in Green House Gases (GHGs) as well as extreme warm days during 2019. A partial summary of the findings in the report includes the following:

“All major greenhouse gases released into Earth’s atmosphere reached new record high concentrations in 2019. The annual global average carbon dioxide concentration at Earth’s surface was 409.8 ± 0.1 ppm, an increase of 2.5 ± 0.1 ppm over 2018, and the highest in the modern instrumental record and in ice core records dating back 800,000 years. Greenhouse gases, along with several halogenated gases, have contributed to a 45% increase in net forcing compared to 1990.

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The second volume of the National Climate Assessment was issued on November 23. The Report clearly states that Climate Change is getting worse, temperatures are increasing at rates unprecedented in modern times and humans are contributing.

”However, the assumption that current and future climate conditions will resemble the recent past is no longer valid (Ch. 28: Adaptation, KM 2). Observations collected around the world provide significant, clear, and compelling evidence that global average temperature is much higher, and is rising more rapidly, than anything modern civilization has experienced, with widespread and growing impacts (Figure 1.2) (CSSR, Ch. 1.9). The warming trend observed over the past century can only be explained by the effects that human activities, especially emissions of greenhouse gases, have had on the climate (Ch. 2: Climate, KM 1 and Figure 2.1).”

The Report “…concludes that the evidence of human-caused climate change is overwhelming and continues to strengthen, that the impacts of climate change are intensifying across the country, and that climate-related threats to Americans’ physical, social, and economic well-being are rising. These impacts are projected to intensify—but how much they intensify will depend on actions taken to reduce global greenhouse gas emissions and to adapt to the risks from climate change now and in the coming decades (Ch. 28: Adaptation, Introduction; Ch. 29: Mitigation, KM 3 and 4).”

The report issued this week, by the Intergovernmental Panel on Climate Change (IPCC), laid out both a scenario for dire impacts from Climate Change and an opportunity to avoid many of those impacts.  The report notes there is still an opportunity to avoid some of the worst effects of Climate Change but the window of opportunity is rapidly shrinking.

The report concludes it is essential to limit the increase in global temperatures to 1.5 C degrees by 2030 in order to avoid some of the most catastrophic impacts of Climate Change. The report notes:

“D1 …Avoiding overshoot and reliance on future large-scale deployment of carbon dioxide removal (CDR) can only be achieved if global CO2 emissions start to decline well before 2030 (high confidence).”

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A recent peer reviewed article raises the the strong possibility of reaching an irreversible threshold in climate change. The article raises the serious potential for what is called “Hothouse Earth” where an irreversible tipping point of climate change is reached.

Published in the Proceedings of the National Academy of Sciences of the United States of America the article notes:

“We explore the risk that self-reinforcing feedbacks could push the Earth System toward a planetary threshold that, if crossed, could prevent stabilization of the climate at intermediate temperature rises and cause continued warming on a ‘Hothouse Earth’ pathway even as human emissions are reduced.”

Earlier this month the government issued its fourth climate science report (NCA4) which, among other things, reinforces the scientific evidence of the contribution by humans to climate change. It is important to note the Report is mandated by the Global Climate Assessment Act of 1990 and was prepared by a group of agencies and individuals with significant credentials:

“The National Oceanic and Atmospheric Administration (NOAA) serves as the administrative lead agency for the preparation of NCA4. The CSSR Federal Science Steering Committee (SSC)¹ has representatives from three agencies (NOAA, the National Aeronautics and Space Administration [NASA], and the Department of Energy [DOE]); USGCRP; and three Coordinating Lead Authors, all of whom were Federal employees during the development of this report. Following a public notice for author nominations in March 2016, the SSC selected the writing team, consisting of scientists representing Federal agencies, national laboratories, universities, and the private sector. Contributing Authors were requested to provide special input to the Lead Authors to help with specific issues of the assessment.”

A sampling of the sobering conclusions of the Report regarding the increasing human influence on climate change, the already extreme impacts and the potential for even more severe effects are quoted below: Continue reading →

Two recent studies outline the potentially devastating economic impacts of  unchecked climate change. In a recent study released by Citigroup, the economic effects of action on climate change versus inaction on climate change were compared, with the conclusion that inaction brought much greater potential economic impacts. This week the Journal Nature issued a report concluding inaction on climate change could result in a 23% reduction in global income by 2100.

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