This was in response to "Get Old, Cut CO2 Emissions (or not)".
An interesting blog posting about research that come to diametrically opposite conclusions. If I were you I would believe the research: Population Aging and Future Carbon Emissions in the United States.
I wrote something about the UK report when it was published. I then sent the researchers a list of questions that challenged the validity of the research model – they declined to respond. http://www.20plus30.com/blog
The link is worth a look.