I have parking of car as a concrete building with 15 meter height. by using with two scheme, one of them design as a flat slab, other one as two-way slab, my solution according to eurocode

my first inquiry is:

what is the criterion of the environmental impact of concrete building to assess that the first building has less environmental impact than other one, I want to represent the environmental impact between them as number, how can I do that please ?

my second inquiry is :

how can I apply wind load on my two scheme please? with simple steps by using hand solution and according to Eurocodes or BS, I wander if I can use tedd program to apply the wind load