Pinatubo wrote on Nov 16^th, 2011 at 4:24pm:

boeing247 wrote on Nov 15th, 2011 at 11:58pm: The carbon emissions also became a big problem as people became more aware of harming the environment. IMO thinking about the carbon emission from airliners is a great joke. It's just a way of airlines and/or government agencies to get more money from users adding carbon emissions taxes to airfares. Who cares about the ammount of carbon emissions from all others sources? Nowadays, there is an estimated amount of over 750 million motor vehicles in the world (Source: How many cars are in the world?). And about manufaturing, refining, chemical and mining processes? And even about households carbon dioxide emissions? Please, let's think about the whole thing and not only about an insignificant portion. Pinatubo.

Here's the carbon emissions of Seattle:
http://hugeasscity.com/images/Seattle_2008_GHG_Transpo_Pie_Chart-2.jpg

Look at this:
http://planetgreen.discovery.com/tech-transport/plane-train-automobile-travel.html


Quote:

I didn't take your statement as being Concorde related, it looked more like a general one to me. However, do you have any reference on this one?

Joe Sutter, head engineer of the 747 project, stated in his book 747 that the Boeing SST was not put into production due to lack of funding and unfeasibility concerns, such as the amount of emissions produced by supersonic jetliners, namely the Concorde.