If the temperatures are increasing in a mountainous region, in order to be sure in that, the evidence can simply be obtained by the vegetation. The mountains tend to be warmer at the lower parts, and as the elevation increases, the temperature decreases. If it is a higher mountain, then we will see that there is certain type of vegetation in the lower parts, above it a belt of another vegetation type, above that one there's usually a belt of grasses, and the highest parts are usually with little to no vegetation. If the temperature increases though, then the vegetation from the bottom will start moving upwards, occupying larger portion, the second layer will move upwards as well, and the grasses will come around the top part of the mountain, with the barren part disappearing from the scene.
Madagascar is the 4th largest island in the world.
The two factors, Temperature and Pressure, have the greatest influence on the state of each of Earth's layers.
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Population of Milan ( Italy ): 5,270,000 ( urban area ), the 2nd city in EU after Paris.
Barcelona ( Spain ) : 4.7 million people.
Hamburg ( Germany ) : 3.5 million people.
Birmingham ( England ) : 1.1 million people.
Answer: The largest European city which is not actually the capital of the country is : A ) Milan.