It's 580 steps atop the roof of Europe, a stairway to hell if humanity does not act fast. French President Emmanuel Macron started his day up the mountain at the famed Sea of Ice that gives onto the continent's highest peak, Mont Blanc. As he contemplated the glacier that has receded in thickness by 120 metres in just one century, he used the photo op - one month before municipal elections - to press new measures to go green. We review what was announced at a special cabinet meeting on Wednesday.