English: This bar graph shows changes in global mean temperature between the 1880s and 2000s. Temperature changes are averaged over each decade. From the public-domain source: "While year-to-year changes in temperature often reflect natural climatic variations such as El Niño/La Niña events, changes in average temperature from decade to decade reveal a long-term warming. Each of the last three decades has been much warmer than the decade before it, with each one setting a new and significant record for the highest global temperature. At the time, the 1980s was the hottest decade on record. But in the 1990s, every year was warmer than the average of the previous decade, and the 2000s were warmer still."

Data

Temperature changes are measured against the 1901-2000 average, and are measured in degrees Fahrenheit. Values given below have been read from the graph and are therefore approximate:

• 1880s: -0.3
• 1890s: -0.4
• 1900s: -0.5
• 1910s: -0.5
• 1920s: -0.26
• 1930s: -0.02
• 1940s: +0.12
• 1950s: -0.03
• 1960s: +0.03
• 1970s: +0.06
• 1980s: +0.35
• 1990s: +0.65
• 2000s: +0.95