Greece

1. Population of Greece is 11.21 millions. Each person uses 550 liters of pure oxygen in a day.

2. The people in Greece need about 212.99 millions of olive trees to make enough oxygen.

3. Environmental Problems - Pollution from factories causes respiratory or heart problems

4. The logistical concerns for building trees are time, money, space, and workers. It would cause a lot of money to hire lots of workers to plant the tree. There might not be that much space to fit 212.99 millions of olive trees It would take a long time for the tree to grow.

5. An olive tree with about 250 leaves makes 30 liters of oxygen a day.

6. Solutions - Shut down factories