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The State Forestry Administration is responsible for the management of public forests in the United States. It manages about 78 million hectares of forests, grasslands, rivers and lakes, and is a unit under the jurisdiction of the United States Department of Agriculture. Officials of the Forest Management Bureau said that there are four major threats to the forest at present. The first is fire and fossil fuels. Fire is the natural enemy of forest, which can also threaten the safety of human life and property. Fossil fuel is the product of the death of plants that grow at the foot of tall plants. According to the Forest Management Bureau, about a quarter of forest fossil fuels are at dangerous levels. Sometimes forest managers need to take the initiative to set appropriate fires to destroy these dead vegetation. At other times, these dead plants need to be removed by hand. The second factor threatening the forest is the invasion of alien species. These non-native plants and animals crowd out native plants and animal species, and may cause huge economic losses. Some of these invasive species are insects, some are viruses, and some are wild kudzu vine and other plants. The third factor is the shrinking of forests and green spaces. According to statistics, on average, more than 1 hectare of forest or green space is occupied by development every minute. Development also divides a large forest into many small pieces. The fourth factor is called uncontrollable causal factor. People can hunt, camp and fish in the national forest. However, due to the negligence of some people, careless behaviors such as using cars casually have also had a negative impact on the forest.