1. Climate Change.
2. Fire Ecology.
3. Renewable Energy.
4. Urban Ecology
5. Remote Sensing and Geographic Information Systems.
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. This is usually due to the long time it takes for them to be replenished. Renewable resources are replenished naturally and over relatively short periods of time. (solar energy, wave energy, etc)
The last chose about Greece. With 98%
