more CO2 is produced by the making and setting of cement than is produced by cars... but they dont talk bout that.... (long time since i looked that up.. maybe its not more anymore, but its a hell of a lot)
I think your right, concrete is one of the biggest contributors because of the way it has to be baked, the difference as I see it between cars and concrete is we can live with less cars but we use concrete for a lot more so its harder to live without especially since there arent any alternatives that I know, there are for cars.
By that I mean think of the number of people who drive a car to work with just one person in for example when they could be car sharing. I know Im quilty of it, but my 1.4 tdci fiesta has low emissions anyway (so I only get to pay £50 road tax a year, shucks
)
I do think that all new homes should be forced to have things like solar panels as well to aid in heating/electricity generation. That would surely help, although sods law the panels probably produce more CO2 than waht theyd save lol.
Theres a guy at work who pays for green electricity, he pays a little more to get electricity provided from renewable sources, great. Except he then leaves every thing on, his pcs etc I bet his tv is on standby 24/7 too. Ejit.