Habitat loss causes the greatest threat to species. The world's forests, plains, lakes, and other habitats continue to disappear as they are harvested for human consumption and cleared to make way for agriculture, housing, roads, pipelines and the other industrial development. Without a plan to create terrestrial and marine protected areas important ecological habitats will continue to be lost.
When an ecosystem has been dramatically changed by human activities such as agriculture, oil and gas exploration, commercial development or water diversion it may no longer be able to provide the food, water, cover, and places to raise young.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.
Last date updated on September, 2014