I’m no expert, but a century worth of data shows the change in global temperatures:
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Global Annual Mean Surface Air Temperature Change
Source: NASA
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Global Air Temperature
Source: Climatic Research Unit : Information sheets
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Global Temperatures of the Last Five Centuries
Source: NOAA Paleoclimatology Program
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Global Glacier Thickness Change
Source: The National Snow and Ice Data Center, Cryospheric Research Since 1976 University of Colorado
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Sea Ice Decline Intensifies
Source: The National Snow and Ice Data Center, Cryospheric Research Since 1976 University of Colorado
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Sea Level Change
Source: University of Colorado at Boulder
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Proxy Temperature Studies
Source: NOAA
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