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KS update 1.3
The [[Sun]] gets a little bit hotter and colder every 11 years. This is called the 11-year [[sunspot]] cycle. The change is so small that scientists can barely measure how it affects the temperature of the Earth. If the Sun was causing the Earth to warm up, it would warm both the surface and high up in the air. But the air in the upper [[stratosphere]] is actually getting colder. Therefore the changes in the Sun are not causing the [[global warming]] which is happening now.
The [[Sun]] gets a little bit hotter and colder every 11 years. This is called the 11-year [[sunspot]] cycle. The change is so small that scientists can barely measure how it affects the temperature of the Earth. If the Sun was causing the Earth to warm up, it would warm both the surface and high up in the air. But the air in the upper [[stratosphere]] is actually getting colder. Therefore the changes in the Sun are not causing the [[global warming]] which is happening now.
According to the United Nations’ [[Intergovernmental Panel on Climate Change]] (IPCC), the current scientific consensus is that long and short-term variations in solar activity play only a very small role in Earth’s climate. Warming from increased levels of human-produced greenhouse gases is actually many times stronger than any effects due to recent variations in solar activity.
According to the United Nations’ [[Intergovernmental Panel on Climate Change]] (IPCC), the current [[scientific consensus]] is that long and short-term variations in solar activity play only a very small role in Earth’s climate. Warming from increased levels of human-produced greenhouse gases is actually many times stronger than any effects due to recent variations in solar activity.
For more than 40 years, satellites have observed the Sun's energy output, which has gone up or down by less than 0.1 percent during that period. Since 1750, the warming driven by greenhouse gases coming from the human burning of fossil fuels is over 270 times greater than the slight extra warming coming from the Sun itself over that same time .[https://climate.nasa.gov/explore/ask-nasa-climate/2910/what-is-the-suns-role-in-climate-change/]
For more than 40 years, satellites have observed the Sun's energy output, which has gone up or down by less than 0.1 percent during that period. Since 1750, the warming driven by greenhouse gases coming from the human burning of fossil fuels is over 270 times greater than the slight extra warming coming from the Sun itself over that same time .[https://climate.nasa.gov/explore/ask-nasa-climate/2910/what-is-the-suns-role-in-climate-change/]
== Climate Change Media ==
== Climate Change Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:Common Era Temperature.svg|[[Global surface temperature]] reconstruction over the past 2000 years using proxy data from tree rings, corals, and ice cores in blue. Directly observed data is in red.
File:Common Era Temperature.svg|[[Global surface temperature]] reconstruction over the last 2000 years using proxy data from tree rings, corals, and ice cores in blue. Directly observed data is in red.
File:1951- Percent of record temperatures that are cold or warm records.svg|In recent decades, new high temperature records have substantially outpaced new low temperature records on a growing portion of Earth's surface.
File:1951- Percent of record temperatures that are cold or warm records.svg|In recent decades, new high temperature records have substantially outpaced new low temperature records on a growing portion of Earth's surface.
File:1955- Ocean heat content - NOAA.svg|There has been an increase in [[ocean heat content]] during recent decades as the oceans absorb over 90% of the [[Earth's energy budget|heat from global warming]].
File:1955- Ocean heat content - NOAA.svg|There has been an increase in [[ocean heat content]] during recent decades as the oceans absorb over 90% of the [[Earth's energy budget|heat from global warming]].
File:1880-_Global_surface_temperature_-_heat_map_animation_-_NASA_SVS.webm|NASA animation portraying global surface temperature changes from 1880 to 2023. The colour blue denotes cooler temperatures and red denotes warmer temperatures.
File:1880-_Global_surface_temperature_-_heat_map_animation_-_NASA_SVS.webm|NASA animation portraying global surface temperature changes from 1880 to 2023. The colour blue denotes cooler temperatures and red denotes warmer temperatures.{{Clarify| reason=cooler and warmer than _what_? If 1880 shouldn't the animation start out pure white?|date=July 2025}}
File:Projected Change in Temperatures by 2090.svg|[[Coupled Model Intercomparison Project#CMIP Phase 6|CMIP6]] multi-model projections of [[global surface temperature]] changes for the year 2090 relative to the 1850–1900 average. The current trajectory for warming by the end of the century is roughly halfway between these two extremes.
File:Projected Change in Temperatures by 2090.svg|[[Coupled Model Intercomparison Project#CMIP Phase 6|CMIP6]] multi-model projections of [[global surface temperature]] changes for the year 2090 relative to the 1850–1900 average. The current trajectory for warming by the end of the century is roughly halfway between these two extremes.
File:CO2 Emissions by Source Since 1880.svg|The [[Global Carbon Project]] shows how additions to {{CO2}} since 1880 have been caused by different sources ramping up one after another.
File:CO2 Emissions by Source Since 1880.svg|The [[Global Carbon Project]] shows how additions to {{CO2}} since 1880 have been caused by different sources ramping up one after another.
File:20210331 Global tree cover loss - World Resources Institute.svg|The rate of global tree cover loss has approximately doubled since 2001, to an annual loss approaching an area the size of Italy.
File:2017 Global warming attribution - based on NCA4 Fig 3.3 - single-panel version.svg|The [[Fourth National Climate Assessment]] ("NCA4", USGCRP, 2017) includes charts illustrating that neither solar nor volcanic activity can explain the observed warming.
</gallery>
</gallery>
== Related pages ==
== Related pages ==