Thermometers directly measuring temperature data on a global scale show the most recent cooling period ended around 
Definitions:
pH
A scale used to specify the acidity or basicity of an aqueous solution, with values ranging from 0 (acid) to 14 (basic).
Bromecresol Purple
A pH indicator dye that changes color from yellow to purple over a pH range of approximately 5.2 to 6.8, commonly used in laboratory settings.
Buffers
Substances that help maintain the pH balance in a solution, resisting changes in pH when acids or bases are added.
Alkaline
Referring to a basic, as opposed to acidic, substance with a pH level greater than 7.
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