i. The first and the most important problem is the ecological disaster which happens at all over the world. One probable solution about this problem is to stop pollutions on the environment!
ii. An other problem as important as above is the economical crisis. All people from all over the world are oppressed from this problem. One good solution is to stop the extravagant purchases
iii. Another really important problem is the unemployment. The most part from all people from all over the world is unemployed.. So, the politicians must focus on human instead the money
iv. The last problem I will refer is the following: The lack of sources of energy. If we could use the energy from the air, from the sun and from the water we could combat the bigger part of this problem..!