Luokka 56

The classic 20th century way to view the relationship among the pines, the bark beetle, and the woodpecker would be to show a food chain. But this alone does not solve the problem for us. A newer approach is to consider the habitat requirements of the pine bark beetle and the woodpecker.

 

Their requirements are somewhat different, but if we overlay a map of one’s habitat requirements over a map of the other’s, we can compare the co-occurrence of habitats. However, human communities are scattered throughout much of the park, and many residents are concerned that wolves would not remain on public land and would threaten local residents as well as back-country hikers and hunters. Also, private lands around the edges of the park, with their greater density of deer, dairy cows, and people, could attract wolves.

 

The Energy Policy Act of 2005, passed by Congress and signed into law by President George W. Bush in the summer of 2005, has been followed by heated debate about energy policy in the 21st century. A number of topics related to energy are being discussed, including the American Clean Energy and Security Act of 2009, which took a serious step toward energy self sufficiency in the United States.