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The highest reliably recorded temperature in the world, [6] [7] 134 °F (56.7 °C), was recorded in Death Valley on July 10, 1913. Temperatures of 130 °F (54 °C) or higher have been recorded as recently as 2005. The 24-hour average July temperature in Death Valley is 101.8 °F (38.8 °C) (1981–2010 NCDC Normals).
A 2011 study projected that the frequency and magnitude of both maximum and minimum temperatures would increase significantly as a result of global warming. [13] According to the Fifth National Climate Assessment published in 2023, coastal states including California, Florida, Louisiana, and Texas are experiencing "more significant storms and extreme swings in precipitation".
According to IPCC Sixth Assessment Report, in the last 170 years, humans have caused the global temperature to increase to the highest level in the last 2,000 years. The current multi-century period is the warmest in the past 100,000 years. [3] The temperature in the years 2011-2020 was 1.09 °C higher than in 1859–1890.
The remaining carbon budget for staying beneath certain temperature increases is determined by modelling the carbon cycle and climate sensitivity to greenhouse gases. [93] According to UNEP, global warming can be kept below 1.5 °C with a 50% chance if emissions after 2023 do not exceed 200 gigatonnes of CO 2. This corresponds to around 4 years ...
The California Climate Action Registry is required to record voluntary greenhouse gas emission reductions made by California entities after 1990, but many of its functions were changed with the passage of SB 527 including; ensuring the public can comment on board meetings, requiring protocols for monitoring and reporting emissions to be ...
An early (2018) warming stripes graphic published by their originator, climatologist Ed Hawkins. [1] The progression from blue (cooler) to red (warmer) stripes portrays annual increases of global average temperature since 1850 (left side of graphic) until the date of the graphic (right side).
Average temperatures in almost all regions in the U.S. have increased in the last 120 years. [1] Annual temperatures averaged across the U.S. have exceeded the 1971–2000 average almost every year in the 21st century. [2] Climate change has led to the United States warming by 2.6 °F (1.4 °C) since 1970. [3]
The hypothesis is that soot released by large-scale fires blocks a significant fraction of sunlight for as much as a year, leading to a sharp drop in temperatures for a few years. This possible event is described as nuclear winter. [89] Humans' use of land impact how much sunlight the surface reflects and the concentration of dust.