Rob,
I heard the vacuous Sienna Miller on Radio 4 this morning too, believing that she was doing her bit by turning her thermostat down by 1 degree, and then jetting all over the world.
Every time she just pops across to LA, there goes another tonne of CO2 - right into the atmosphere.
But it's all OK - she's "Offsetting".
She gave absolutely no further details about how or what her offsetting involved, whether it was effective or whether the offsetting company that her agent had chosen wasn't just pocketing cash from the gullible.
Perhaps by appearing on "Today" she will have encouraged a few listeners to collectively save a few additional tonnes - so that she can continue her vital role.
Also on topic is the news that Yvo de Boer, head of the UN Framework Convention on Climate Change (UNFCCC), has stated that it is perfectly acceptable (in his opinion) for rich countries to pay poorer countries in full, to offset their carbon dioxide emissions.
Story here:
http://newsvote.bbc.co.uk/1/hi/sci/tech/6957328.stmPreviously the agreement had been for rich countries to tackle the bulk of their own CO2 emissions locally, allowing only a very small percentage to be offset to poorer nations.
This is clearly a move to let the Western world off the hook, and to further procrastinate actually doing anything about CO2 emissions.
In my book, if you make a mess - you clean it up, not pay some poor Chinese not to make an equivalent sized mess!.
Ken