Fires are raging, ice is melting. In a bid to save the singular "purity and fragility" of the rapidly-melting Arctic ice - and in support of eight million voices calling for its protection - Greenpeace has released a video of renowned Italian pianist Ludovico Einaudi performing on a floating platform before Norway's Wahlenbergbreen glacier, cracking and groaning even as he plays - a haunting reminder of what's at stake.