May I correct the headline, Mr. Chirgwin?
I read the press release. It appears that the plants are not seeking colder temperatures, just higher altitudes but with the same temperature. It's an important distinction. Unfortunately, the plants on the top of mountains have nowhere else to go, so they're being hammered hard. To quote the article:
Harald Pauli added, "The observed species losses were most pronounced on the lower summits, where plants are expected to suffer earlier from water deficiency than on the snowier high peaks. Climate warming and decreasing precipitation in the Mediterranean during the past decades fit well to the pattern of shrinking species occurrences. Additionally, much of the Mediterranean region is projected to become even dryer during the upcoming decades".
It's happening in my state of Queensland as well. There are two mountains in northern Queensland - Bartle Frere and Bellenden Ker - that tower 1.5 km above the surrounding area. The bottom is tropical rainforest; the top is sub-tropical/temperate rainforest. The areas at the summit are going to be changed within the next few decades.