How does 'screen' impact environment variables?

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http://unix.stackexchange.com – I noticed a difference in 'env' before and after a 'screen' call, is there any additional clarity on what gets called (for setting environment variables)? I couldn't see any clear explanation from a quick search on 'man screen' Some googled queries on the topic: http://alan.lamielle.net/2009/03/09/environment-variables-and-gnu-screen http://superuser.com/questions/105954/updating-screen-session-environmen... I guess a more specific sub-question would be, what is not instantiated in a screen session vs. that of a normal log-in? (HowTos)