How does flying affect my CO2 emmissions

Using very rounded numbers for simplicity and a not very scientific approach, it does still make you think.
In 2000 the world's greenhouse emissions were 34 billion tons of CO2-equlivalent per year and the approximate population of the world is 6 billion.
So roughly we can say that the average emissions per person is 5 or 6 tons of CO2-equivalent per year.

Average person's emissions = 6 tons

A typical round-trip intercontinental flight (whatever that is) emits about 2 tons of CO2 per passenger.

Average round trip = 2 tons

So one trip per year is something like a third of the average person's carbon emissions.

Please read the excellent (and free) book Sustainable Energy without the hot air from David JC Mackay 2009

Powershell help - The three most important commands in the Windows PowerShell

Just starting out with the Windows PowerShell and I think the most important command are:

• Get-help - first line support, what do I do?
• Get-command - found the command, How do I use it?
• Get-member - What does this do? List it's members.

Get-Help

It accepts wildcards and is not case-sesitive.
So,

get-help *service* 

will list all topics that have object in the topic.


You can find more info about the topic by asking for help on the name of the specific.
e.g.

get-help start-service

This help text is very useful but there's even more.

The full help can be found by using the verbose parameter, full

get-help start-service -full

Get-Command

get-command -noun service 

This will list all the commands with the word service in the name.

You can also look for a verb, e.g.

get-command -verb get

Get-member

To use this we need to use the pipeline command which is:

|

Basically, without explaining pipelining, the output from the first command is filtered into the second.

So. I have found that the command I am interested in is get-service.
I want to find the members of that service. So I pipe the command into the get-member command.

get-service | get-member

 Running the above we find the Properties and Methods for the command get-service


And one other thing:

-WhatIf

If you're unsure what a command will do, then add the -whatif parameter and let PowerShell tell you what will happen.

stop-process -name * -whatif