and, finally, in something sort of akin to the debris left on mount everest by climbers, there have beenon the bottom of the mariana trench as well, and those apparently are left over from robotic scientific vehicles that send their data to the surface through these very fine fibre—optic tethers, which, when they become 11 and 12 and 13 kilometres long, often times are cut loose and jettisoned rather than trying to haul them back in. i cannot imagine anything more depressing than learning that there is human detritus at those very deepest levels of the ocean. i'm just wondering, as a final thought, where do you believe human beings should put their priorities right now? because we live in a world, clearly, a world where resources are very finite and they have to be rationed. should we be focusing most of our efforts on doing what it takes, spending what it takes, to clean up our planet, our oceans, decarbonise, do everything necessary to give us a sustainable future here on earth or do you believe we should be pouring very significant resources into that effort that we've discussed, to g