Misleading discussion Climate graphs humansarefree.com

Misleading use of graphs- Humansarefree.com

US temperature Data

The graphs below show the 1999 published data from NASA. On left there seems to be no pattern on the right the global temperature anomalies show an increasing trend. Anomalies are measured by taking the difference between yearly temperatures and the 30 year average, see the Y-axis, 1.0 means that the yearly average was 1degree hotter than the 30 year average. In the US the temperatures in the 1930s were very hot over a wide spread area, this is the dust bowl period.

The NASA 2017 graph shows the same data but has the data from 2000 to 2018 shown and a statistical trend line.

Humansarefree.com make the claim that ‘this is significant scientific fraud’, there is no evidence for this and the trend shown should give rise to concern.

Heatwave Index

This graph is used to state that there is no discernable pattern of temperature and that it was hotter in the 30s.

The Y-axis is not easy to interpret, but bear in mind this graph shows HEATWAVE conditions only, defined to be above the 10 year average over four consecutive days. The graph does not enable you to say if the average temperature is increasing or is the frequency of hot days increasing.

The graph is for temperature data across the US, the data shown on the following graphic is restricted to US cities.

The following graph shows that the frequency of heat waves and the length is increasing n US cities. (source https://www.globalchange.gov/browse/indicators/us-heat-waves).

This graph below shows the change in hot days and hot nights shown as a percentage of land areas.

How do we interpret the graph? Hot nights are on the increase, there is recent dip in day time temperature coverage of land. The trend line is upwards.

Source http://www.climatesignals.org/resources/hot-days-and-hot-nights-increasing-united-states

Finally, the clam 30,000 scientists are against climate change dates to a petition circulating since 1998, there are numerous fact checks on this and I feel at the minimum such criticism ought to be taken into account before making such claims. Certainly they made Hoax claim.

In conclusion, the data and discussion on the Humansarefree is misleading an does not attempt a sound analysis.

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