A net zero plan is certainly obtainable.
We'll be utilising things such as sustainable timber, with less reliance on steel and concrete.
We'll be using electricity, with heat pumps for heating and hot water. We already know that solar panels will play a big part, with some stadiums globally having up to 40,000 square meters of coverages for solar panels. Whilst it won't be that big, it will still be a net contributor to the grid.
The club could well utilise the reduction in cars to site (through traffic consultants) showing their reduction in their total carbon footprint, as a side-product of moving.
Given that the construction industry uses 400 million tonnes of material every year, of which 100 million tonnes are wasted, I'd imagine re-work will be a big focus for the tender phase, with ISO-19650 being specified and a capable CDE being deployed. This all aids in reducing rework, increasing collaboration, and reducing the time on site (there-in also reducing construction traffic & wastage).
Whilst none of the pre-planning consultants are modular based, this could be something we look at during our tender phase and technical design phase. I'd also imagine that recycled materials will play a big part in the construction - the Qatar World Cup had a few designs (which I was fortunate enough to see in their design phase!)
I'd imagine there will be rainwater collection and recycling systems too.
There's more that I can't talk too much about right now, but I can say for certain that you *CAN* build a Net Zero building, both in material, construction and operation. Just don't expect it to look too traditional!