The Little Green Data Book 2011

This year's edition introduces a
new green national accounting aggregate, adjusted Net
National Income (aNNI), into the set of environment and
development indicators. Using the underlying methodology of
the Adjusted Net Saving (ANS) measure, which has been
published since the first edition in 2000, aNNI provides a
broader measure of national income that accounts for the
depletion of natural resources. The standard measure of
income in the United Nations System of National Accounts
(SNA) is Net National Income (NNI), defined as Gross
National Income (GNI) minus depreciation of fixed capital.
aNNI starts with NNI, and then subtracts a charge for the
depletion of energy, mineral and forest resources,
reflecting the decline in asset values associated with their
extraction and harvest, this is analogous to depreciation of
fixed assets.