With altitude, living conditions change, temperatures decrease, the period of snow cover and cold increases, the soil becomes scarce and the solar radiation intensifies. Over time, fauna and flora adapt to the harsh climatic conditions linked to altitude. So as we descend down from the summit comprised of eroded out rocks and scree that are covered in mosses and lichens down to the alpine pastures where the seasons are short. When we hit the tree line, that is the point where the growing season is sufficient for certain species to thrive. As we descend further the pines and larches make way for deciduous species that give us the spectacular flash of autumnal colour. In turn these fade away as we tumble down towards the coastline and its familiar Mediterranean trees and shrubs.