Researchers have developed a program that measures how many planet earths are needed to provide the resources humanity is using. this ecological yardstick is called ecological footprint
The Global Footprint Network promotes the ecological footprint as a way to assess how much nature is needed to sustain a given number of people or an economy. Through an ecological accounting system, it monitors this demand. The accounts compare the biologically productive areas used by people for consumption to the biologically productive areas available in a region or around the world (biocapacity, the productive area that can regenerate what people demand from nature).
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Because of genetic variation
GDP (Gross market value) measures the market value of all final goods and services produced within a country in a given period of time.
GNP (Gross National Product) measures the market value of all final goods and services produced by a country's citizens or residents. The difference is subtle but important.
GNP excludes economic activity that occurs for example in the U.S. but is owned by foreigners and includes American economic activity that occurs in other countries.
GDP is place based whereas GNP is ownership based. Thus if a foreigner starts a company in Silicon valley, this will count as GDP, but not GNP. If General Electric opens a new plant in India, this investment will be included in GNP but not GDP.