Comments by "Old Scientist" (@OldScientist) on "Bill Nye describes extreme heat impacting millions of Americans" video.

There is no objective observational evidence that we are living in a global climate crisis. The UN's IPCC AR6, chapter 12 "Climate Change Information for Regional Impact and for Risk Assessment", section 12.5.2, table 12.12 confirms there is a lack of evidence or no signal that the following have changed: Air Pollution Weather (temperature inversions), Aridity, Avalanche (snow), Average precipitation, Average Wind Speed, Coastal Flood, Agricultural drought, Hydrological drought, Erosion of Coastlines, Fire Weather (hot and windy), Flooding From Heavy Rain (pluvial floods), Frost, Hail, Heavy Rain, Heavy Snowfall and Ice Storms, Landslides, Marine Heatwaves, Ocean Acidity, Radiation at the Earth’s Surface, River/Lake Floods, Sand and Dust Storms, Sea Level, Severe Wind Storms, Snow, Glacier, and Ice Sheets, Tropical Cyclones.
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America has by far the best instrumental data, and it shows overall the South East cooled in the last 120 years. Though that sentence doesn't do justice to the climate's variability. Data from NOAA (2021) shows uneven warming in the twentieth century focused on the South East through until it peaks in the 1930s. Where it should be noted the highest average maxima temperature records remain to this day. Some areas of the West US showed negligible warming. There then followed a general continent-wide cooling into the 1970s. Then the West began to warm, but the South East continued to cool, so that by the end of the century some SE areas were cooler than they had been a century before. This pattern of uneven warming continues up to the present day.
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Heat waves have not been increasing in intensity or frequency in the United States, which has by far the best meteorological data both spatially and temporally. Data from NOAA's Climate Reference Network shows no sustained increase in daily high temperatures in the United States since 2005 when that network began. In recent decades in the United States, heat waves have been far less severe than they were in the 1930s. At that time Heatwaves were more than 6 times worse with greater frequency and covering a larger area than the last decade (EPA). The most severe heatwave year was 1936, and was about 13 times worse than current. In 2023 only 4 US states have achieved higher temperatures than 1936. Many states in 1936 achieved temperatures 15° hotter than the present. The all-time high temperature records set in most states occurred in the first half of the twentieth century.
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