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Poseidon Lost

We thought the sea was infinite and inexhaustible. It is not. Calling for a new vision to save our oceans. Table of Contents | Digital Edition
Guardian Environmental Network

Why do they use the years 1951 - 1980 as the baseline average?
I worked with world weather data for 13+ years as a government computer guy doing programming for meteorologists and enjoyed opportunities to create visual representations of the science. I watch this video and many questions come to mind such as... How many data points were used? over time? Where were they? How accurate was the equipment? Were there extraterrestrial events (i.e., solar activity) that are relevant? I don't question the concept of "global climate change," but merely have to know more about the numbers behind the pictures.