Alun Hubbard, a glaciologist, spends a lot of time on the Greenland ice sheet, and he does some of the most dangerous scientific work I have ever seen. That includes rappelling down into moulins – the deep holes that meltwater rivers bore through the ice sheet. He describes the scene below the surface and the way millions of deep cracks in the ice are allowing water to deteriorate the ice sheet from the inside as global temperatures rise. That meltwater and Greenland’s accelerating ice loss have widespread impacts for coastal communities around the world. The photos alone will send chills up your spine.

Stephen Khan in London adds: France has been gripped by riots in recent days following the police shooting of a teenage boy. Click here for analysis of the crisis. And as Australia go 2-0 up in the Ashes series of Test cricket after a dramatic and controversial match in London, we consider England's cavalier style. It may not quite be winning them Ashes Tests (yet?), but it is winning the sport new fans.

Stacy Morford

Environment + Climate Editor, US edition

Richard Bates and Alun Hubbard kayak a meltwater stream on Greenland’s Petermann Glacier, towing an ice radar that reveals it’s riddled with fractures. Nick Cobbing.

Meltwater is hydro-fracking Greenland’s ice sheet through millions of hairline cracks – destabilizing its internal structure

Alun Hubbard, University of Tromsø

Glaciologists are discovering new ways surface meltwater alters the internal structure of ice sheets, and raising an alarm that sea level rise could be much more abrupt than current models forecast.

The mother of Nahel, who was shot dead by police in Nanterre, leads a rally in is name. EPA/Yoan Valat

French riots: when police shot a teenager dead, a rumbling pressure cooker exploded

Joseph Downing, Aston University

I’ve interviewed disaffected people across French suburbs. Their anger has been mounting for years.

England captain Ben Stokes (second right) speaks to Stuart Broad during day four of the first Ashes test match. PA Images / Alamy Stock Photo

The Ashes: how England cricket’s head coach Brendon McCullum developed his ‘Bazball’ style

David Turner, Anglia Ruskin University; Matt Jewiss, Anglia Ruskin University

Bazball is aggressively attacking, highly entertaining and piles pressure on opponents by scoring runs quickly.