Doggerland is the name of a vast plain that joined Britain to Europe for nearly 12,000 years, until sea levels began rising dramatically after the last Ice Age. Taking its name from a prominent shipping hazard—Dogger Bank—this immense landbridge vanished beneath the North Sea around 6000 B.C. It was a busy thoroughfare for ancient hunters and gatherers. But archaeologists hardly gave it a thought until 2002, when British researchers saw seismic survey data from the petroleum industry.
The consumption values for coal, oil, and natural gas in million tonnes of oil equivalent (MTOE) have been added and converted in kcal, using the conversion factor 1 MTOE = 10,000,000,000,000 kcal. The result has been divided by 365 and again by the total world population from world Bank data for each year.The data for access to improved sanitation facilities can be used as is from the World Bank data set.