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Projected global surface temperature changes relative to 1850–1900, based on CMIP6 multi-model mean changes. The IPCC Sixth Assessment Report defines global mean surface temperature (GMST) as the "estimated global average of near-surface air temperatures over land and sea ice, and sea surface temperature (SST) over ice-free ocean regions, with changes normally expressed as departures from a ...
Since then, it has increased about a full 1°C—in a time period less than 1/3,000th the width of the top chart. Bottom chart: This 1°C increase, commonly called global warming, accelerated since 1980—a period less than 1/20,000th the width of the top chart. SOURCES (and related explanations): 1. Top chart (800,000 years): — Data itself:
A reconstruction of Arctic temperatures over four centuries by Overpeck et al. 1997 reached similar conclusions, but both these studies came up against the limitations of the climate reconstructions at that time which only resolved temperature fluctuations on a decadal basis rather than showing individual years, and produced a single time ...
Line charts — Accepts up to six datasets. (updated 30 August 2023) Vertical bar charts (column charts) — Accepts up to six datasets. Toggle between clustered and stacked charts; user can adjust "Yfloor"—the Y level (usually=0) from which columns rise or fall; user chooses to keep or ignore negative input values. (updated 27 August 2023)
English: Two charts of global average temperature over respective time periods: 2,000 years and 139 years, showing current global warming in perspective. SOURCES (and related explanations): 1. Top chart (2,000 years): Wikimedia image file File:Temperature reconstruction last two millennia.svg by User talk:Femkemilene; 2. Bottom chart (139 years):
The "border" temperature between red and blue stripes was chosen as the average of the highest and lowest temperature values (not as an average of a date range as is customary in warming stripes). Data for Version 1 is through 2023, updated over the data shown in the 2019 Related File linked below.
English: Bar chart of global surface air temperature (global warming), categorized by decade, showing range of temperatures during each decade that were above, and that were below, that decade's average temperature.
Line charts — Accepts up to six datasets. (updated 30 August 2023) Vertical bar charts (column charts) — Accepts up to six datasets. Toggle between clustered and stacked charts; user can adjust "Yfloor"—the Y level (usually=0) from which columns rise or fall; user chooses to keep or ignore negative input values. (updated 27 August 2023)