How to get all the environment variables from PowerShell

get-childitem env:

ALLUSERSPROFILE                C:\ProgramData
APPDATA                        C:\Users\majith\AppData\Roaming
APR_ICONV_PATH                 C:\Program Files\Subversion\iconv
CATALINA_HOME                  D:\SW TechStack\apache-tomcat-6.0.37
CLASSPATH                      .;D:\Personal Others\Jars\selenium-server-sta..
CommonProgramFiles             C:\Program Files\Common Files
COMPUTERNAME                   MAJITHLT
ComSpec                        C:\Windows\system32\cmd.exe
FP_NO_HOST_CHECK               NO
HOMEDRIVE                      C:
HOMEPATH                       \Users\majith
JAVA_HOME                      C:\Program Files\Java\jdk1.6.0_30\
JRE_HOME                       C:\Program Files\Java\jre6
LOCALAPPDATA                   C:\Users\majith\AppData\Local
LOGONSERVER                    \\PLATINUM
LSERVRC                        C:\ProgramData\HP\Functional testing\License\..
NUMBER_OF_PROCESSORS           4
OS                             Windows_NT
Path                           %SystemRoot%\system32\WindowsPowerShell\v1.0\..
PATHEXT                        .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;...
PROCESSOR_ARCHITECTURE         x86
PROCESSOR_IDENTIFIER           x86 Family 6 Model 58 Stepping 9, GenuineIntel
PROCESSOR_LEVEL                6
PROCESSOR_REVISION             3a09
ProgramData                    C:\ProgramData
ProgramFiles                   C:\Program Files
PSModulePath                   C:\Users\majith\Documents\WindowsPowerShell\M..
PUBLIC                         C:\Users\Public
RanorexPath                    C:\Program Files\Ranorex 4.1\
SESSIONNAME                    Console
SystemDrive                    C:
SystemRoot                     C:\Windows
TEMP                           C:\Users\majith\AppData\Local\Temp
TMP                            C:\Users\majith\AppData\Local\Temp
USERDNSDOMAIN                  IND.DOMAIN.STEELWEDGE.COM
USERDOMAIN                     IND
USERNAME                       majith
USERPROFILE                    C:\Users\majith
VS100COMNTOOLS                 C:\Program Files\Microsoft Visual Studio 10.0..
windir                         C:\Windows
windows_tracing_flags          3
windows_tracing_logfile        C:\BVTBin\Tests\installpackage\csilogfile.log

 Example : get