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The cooling period is reproduced by current (1999 on) global climate models that include the physical effects of sulfate aerosols, and there is now general agreement that aerosol effects were the dominant cause of the mid-20th century cooling. At the time there were two physical mechanisms that were most frequently advanced to cause cooling ...
Most research has used vanadium dioxide (VO2), an inorganic compound, to achieve temperature-based 'switchable' cooling and heating effects. [20] [21] While, as per Khan et al., developing VO2 is difficult, their review found that "recent research has focused on simplifying and improving the expansion of techniques for different types of ...
Global warming occurs when earth receives more energy than it gives back to space, and global cooling takes place when the outgoing energy is greater. [3] Multiple types of measurements and observations show a warming imbalance since at least year 1970. [4] [5] The rate of heating from this human-caused event is without precedent.
The World Meteorological Organization estimates there is an 80% chance that global temperatures will exceed 1.5 °C warming for at least one year between 2024 and 2028. The chance of the 5-year average being above 1.5 °C is almost half. [87] The IPCC expects the 20-year average global temperature to exceed +1.5 °C in the early 2030s. [88]
C3S said data from January to November had confirmed 2024 is now certain to be the hottest year on record, and the first in which average global temperatures exceed 1.5 degrees Celsius (2.7 ...
Older Peron warm and wet, global sea levels were 2.5 to 4 meters (8 to 13 feet) higher than the twentieth-century average 3900: 5.9 kiloyear event dry and cold. 3500: End of the African humid period, Neolithic Subpluvial in North Africa, expands Sahara Desert 3000 – 0: Neopluvial in North America 3,200–2,900: Piora Oscillation, cold
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