How long will it take for new forests to grow back?

The environmental group the WWF says it will take at least two decades for new forests in areas of Greece destroyed by recent fires to grow back. The fires which killed 65 people raged across much of southern Greece in August. The WWF director in Greece Dimitris Karavellas told BBC that they would establish a group of lawyers to intervene if lands developers try to take advantage of the disaster.
Question: How long will it take for new forests to grow back?

In Paris, police have removed more than 200 Africans from a church. They had entered France illegally. The Africans had occupied the church for almost two months. They were demanding the right to remain in France. Ten of the protesters had been refusing to eat. Officials took them to a hospital.
Question: Why did the Africans occupy the Paris church?