Answer : The correct answer is : The University of Kansas Professor, Donald Worster is a leader in the field of environmental history. In his book Dust Bowl: The Southern Plains in the 1930s he says that the Dust Bowl was formed in just 50 years, the Americans made their way through a very ruthless and devastating continent, summarizes that the Dust Bowl was the inevitable result of a culture that deliberately and consciously set out the task of dominating and exploiting the earth. The United States found volatile land destroying the ecological balance. But Professor Douglas Hurt head of the history department at Purdue, in his book The Dust Bowl: An Agricultural and Social History says that dust storms were not exclusive to the 1930s, that many factors contributed to their formation, such as : soils subject to wind, erosions, droughts, the nature of the soil and the technological abuse of the land which could have been stopped.
The United States and the Islamic Republic of Iran have had no formal diplomatic relationship since that date. Switzerland is the U.S. protecting power and provides limited consular services to U.S. citizens in Iran. Iran has no embassy in Washington, D.C
