Two stories of ecological disruption: the great sea star wasting, and a graveyard of trembling aspens. As climate change unfolds, one of the scariest prospects is that we will witness large scale ecosystem collapse. So is that moment already upon us? Will we be able to recognize the symptoms in time, and do we have enough information to take steps in advance? In both of today’s stories, from the oceans to the mountains, scientists are trying to understand the magnitude of ecological transformation underway – and what that might mean for the future.