It is worse than we thought

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It is worse than we thought


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The Paris Agreement’s long-term goal is to keep the increase in global average temperature to well below 2 °C above pre-industrial levels; and to limit the increase to 1.5 °C, since this would substantially reduce the risks and effects of climate change.

 

Percentage of Region by Temperature Category

 

Below, is an explanation of the different elements of this bar chart.

 

This bar chart was made, using the GISTEMP gridded temperature series (Land-Ocean Temperature Index, ERSSTv5, 1200km smoothing).

 

• the Arctic region is anything north of the 66N line of latitude. The Arctic is approximately 4% of the Earth.

• the Antarctic region is anything south of the 66S line of latitude. The Antarctic is approximately 4% of the Earth.

• Land is anything between the 66N line of latitude, and the 66S line of latitude, where you can stand without getting your feet wet. Land is approximately 26% of the Earth.

• Ocean, is anything between the 66N line of latitude, and the 66S line of latitude, where your feet get wet, if you stand there. Ocean is approximately 66% of the Earth.

 

I am planning to make some more bar charts, which are even more detailed than this one. Looking at the different regions, in different hemispheres etc. I have all the data, I just need to analyse it.

 

To determine which 2 x 2 latitude-longitude cells were Land, and which were Ocean, I digitised a big black and white map of the world. This turned the image into 0’s and 1’s, depending on the colour on the map. 1’s corresponded to Land, and 0’s corresponded to ocean. This might not be perfect, but it looked good, and was much faster than doing it manually.

You can judge for yourself, how good my method was, for working out what was Land, and what was Ocean. The following map shows the areas that I used for each region.

The legend is:

  • yellow = Arctic region
  • green = Antarctic region
  • blue = Ocean
  • orange = Land

World Warming By Region - Regions