The  carrying  capacity  of  Earth  for humans can be estimated by the
   ecological <A ClAsS=WWW Href="http://0-search.epnet.com.lrc.cod.edu/login.aspx?direct=true&amp;db=aph&amp;an=19599668" oNClick="popurlt('http://0-search.epnet.com.lrc.cod.edu/login.aspx?direct=true&amp;db=aph&amp;an=19599668');txtcolor('footprint_1','gray');return false;" Id=footprint_1 ClAsS=WWW>footprint?</A> of different populations.
   One  measure  of the ecological <A ClAsS=WWW Href="http://0-search.epnet.com.lrc.cod.edu/login.aspx?direct=true&amp;db=aph&amp;an=19599668" oNClick="popurlt('http://0-search.epnet.com.lrc.cod.edu/login.aspx?direct=true&amp;db=aph&amp;an=19599668');txtcolor('footprint_1','gray');return false;" Id=footprint_1 ClAsS=WWW>footprint?</A> of a region is the amount of
   carbon products consumed.
   Ecological  impact  is  highest in areas of high population density or
   high per capita consumption.
   What is your ecological <A ClAsS=WWW Href="http://0-search.epnet.com.lrc.cod.edu/login.aspx?direct=true&amp;db=aph&amp;an=19599668" oNClick="popurlt('http://0-search.epnet.com.lrc.cod.edu/login.aspx?direct=true&amp;db=aph&amp;an=19599668');txtcolor('footprint_1','gray');return false;" Id=footprint_1 ClAsS=WWW>footprint?</A>?