‘There is no evidence’ — Yes, there is
(Part of the How to Talk to a Climate Skeptic guide)
Objection: Despite what the computer models tell us, there is actually no evidence of significant global warming.
Answer: Global warming is not an output of computer models; it is a conclusion based on observations of a great many global indicators. By far the most straightforward evidence is the actual surface temperature record. While there are places — in England, for example — that have records going back several centuries, the two major global temperature analyses can only go back around 150 years due to their requirements for both quantity and distribution of temperature recording stations.
These are the two most reputable globally and seasonally averaged temperature trend analyses:
Both trends are definitely and significantly up. In addition to direct measurements of surface temperature, there are many other measurements and indicators that support the general direction and magnitude of the change the earth is currently undergoing. The following diverse empirical observations lead to the same unequivocal conclusion that the earth is warming:
- Satellite Data
- Borehole analysis
- Glacial melt observations
- Sea ice melt
- Sea level rise
- Proxy Reconstructions
- Permafrost melt
There is simply no room for doubt: the Earth is undergoing a rapid and large warming trend.
More stories in this series:
(Part of the How to Talk to a Global Warming Skeptic guide) Objection: CO2 levels are recorded on top of Mauna Loa … a volcano! No wonder the levels are so high. (image courtesty of Global Warming Art)
(Part of the How to Talk to a Global Warming Skeptic guide) Objection: The apparent rise of global average temperatures is actually an illusion due to the urbanization of land around weather stations, the Urban Heat Island effect.
(Part of the How to Talk to a Global Warming Skeptic guide) Objection: One hundred and some years of global surface temperatures is not long enough to draw any conclusions from or worry about anyway. Answer: The reliable instrumental record …
Get Grist in your inbox