"But I think the more we can get big multinationals sharing data and collaborating, we're only going to get much better outcomes from it."Central to BHP and Rio Tinto's reluctance to commit to a decarbonisation timeline beyond the broad-scale promise of net zero by 2050 is the challenge of scalability.The currency of a Pilbara mine site is not ore But significant?The most important part of this picture sat outside the frame teed up for the media: the 62 diesel trucks set to operate at the same mine for more than a decade.Incoming BHP chief executive Brandon Craig, who takes the reins today with a chance at generation-defining change, will also need to present shareholders with a new climate plan in the next two years.Because if, by their own admission, the miners are not convinced, why should we be?