tramp-remote-process-environment

tramp-remote-process-environment is a variable defined in `tramp-sh.el'.
Its value is

("TMOUT=0" "LC_CTYPE=''" "TERM=dumb" "EMACS=t" "INSIDE_EMACS='25.0.50.2,tramp:2.2.11-pre'" "CDPATH=" "HISTORY=" "MAIL=" "MAILCHECK=" "MAILPATH=" "PAGER=\"\"" "autocorrect=" "correct=")

Documentation:
List of environment variables to be set on the remote host.

Each element should be a string of the form ENVVARNAME=VALUE. An
entry ENVVARNAME= disables the corresponding environment variable,
which might have been set in the init files like ~/.profile.

Special handling is applied to the PATH environment, which should
not be set here. Instead, it should be set via `tramp-remote-path'.

You can customize this variable.