swamps, like those in the Hula Valley. Over fifty years, the JNF planted over 260 million trees largely in semi-arid, rocky, hilly terrain in which cultivation is not cost-effective and the risk of land degradation is high. While the Ministry of Agriculture is the official regulator of Israel's forests, the JNF is responsible for the implementation of forest management and afforestation. In 2006, the JNF signed a 49-year lease agreement with the State of Israel which gives it control over of Negev land for the development of forests. The JNF has been criticized for planting non-native pine trees which are unsuited to the climate, rather than local species such as olive trees. Others say that JNF deserves credit for this decision, and the forests would not have survived otherwise. According to JNF statistics, six out of every 10 saplings planted at a JNF site in Jerusalem do not survive, although the survival rate for planting sites outside Jerusalem is much higher – close to 95 percent. The Israeli newspaper Maariv claimed that workers remove saplings daily to allow more tourists to plant the following day, but the JNF denied this and said it would sue the paper for libel. The Union for Environmental Defense has criticized the fund's forestry practices for "overreliance on highly flammable pine trees" and overuse of toxic herbicides, in the context of minimal government and public scrutiny. Some forests have been planted for security reasons and as a means of demarcating Israeli space. Critics argue that many JNF lands outside the West Bank were illegally confiscated from Palestinian refugees, and that the JNF furthermore should not be involved with lands in the West Bank. Shaul Ephraim Cohen has claimed that trees have been planted to restrict Bedouin herding. Susan Nathan wrote that forests were planted on the site of abandoned Arab villages after the 1948 war. Nathan also writes that olive trees were replaced by pine and cypress trees and that JNF afforestation policy erases traces of the Arab presence prior to 1948. In 2008, the JNF announced that historical information plaques erected in JNF parks and forests would cite the names of the Arab villages formerly located there. Since 2009, the JNF has been helping the Palestinian Authority plan public parks and other civic amenities for the Palestinian city of Rawabi, north of Ramallah. The JNF provided the Palestinian Authority with 3,000 tree seedlings for