Greece is considered a Mediterranean "hot spot" because it's so vulnerable to climate change. One top scientist warns if the country's greenhouse gas emissions are not reduced, the country will experience even more extreme weather-related events. Christos Zerefos is the President of the Athens National Observatory. He's an internationally renowned professor of atmospheric physics. He says extreme weather events will continue in Greece. He believes this will affect tourism - its top source of income, agriculture, and society as a whole. [Christos Zerefos, President, Athens National Observatory]: Our country is in the position where we are going to lose something like 10 to 20 percent of our water availability in the next 50 or so years, and this will have consequences to our agriculture and ecosystems." In the last few years Greece has suffered from drought, heat waves, fires and floods. Zerefos says the country has to be prepared for big changes. A National Observatory study shows if greenhouse gas emissions continue at the current rate, it will cause temperatures to increase by as much as 7 degrees by 2071. This will severely affect water levels. In the last 20 years rainfall has decreased 20 percent, and Greece has experienced drought for the last two years. 2007 was an especially hot and dry year. Water levels dropped dramatically, crops on the island of Crete rotted, and a heat wave killed five people with a record-breaking temperature of 46 degrees Celsius. Forest <b>...</b>