Convergent plates.
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Vast parts are inaccessible or have harsh winters and/or hot dry summers. It’s costly to access and use the natural resources from the eastern 2/3s of this huge country. While it has rich multiethnic populations, most of the people live in the nearly landlocked, western portion of the country. This vast plain has been the route for numerous invasions from both the east and the west (the last being the Nazis during WW2).
Answer:
Introduction of good farming practices
Growing crops that don't require a lot of water
Building of green houses
Explanation:
According to the key written on the bottom left, countries such as Italy and parts of Greece are humid subtropical