They do already - different markets have different fuel qualities and amounts of sulphur so LR will supply for example a different map for cars going to Africa than those going to China or Europe How can carbon have a footprint, it has no feet?
Now driving - RRE Coupe Dynamic Lux Auto with Plus pack, Fuji White, Ebony, SD4 with tow pack
Gone - 2010MY FFRR TDv8 Stornoway and Ivory, Privacy - the pace of a TDv8 RRS, the incomparable grace of a Range Rover
Gone but will be missed- RRS Tdv8 HSE Stornoway Grey with Ebony Leather
Gone (only a little missed) RRS Tdv6 2.7SE Giverny Green/Aspen
Defender 90 County HT in Epsom Green

I thought the main point remapping places state is that all cars a produced with a map for the worst possible situation ? 2002 Honda VFR800
2002 Toyota Celica 140 Silver (mid life crisis - again!)
2007 FL2 GS Manual Army Reconnaissance Green + freel2.com sticker
2004 Toyota Celica 140 Black - Gone
2000 Toyota Celica 140 Silver - Gone
1998 Toyota Celica ST Pearl Green - Gone
1996 Nissan Primera 1.6 - Gone
1994 Rover Montego 1.6 Auto - Gone

I was also under the impression that the engine mapping was one standard to allow for the different fuel grades in different countries, and that we in the UK and other countries can take advantage of the better quality fuel by having a re-map.
If different global markets had different mapping that would mean we could theoretically not drive outside of the UK and certain countries without damaging our engines, therefore all must be mapped for the worst case fuel scenario.