There are many possible costs of using renewable energy in that they take large investments upfront to build infrastructure that will then be able to create savings in the long run of using renewable energy. In addition renewable energies are often more expensive in the short run in comparison to fossil fuel energies. The costs are usually in regards to building or implementing new technologies like wind mills or solar panels.
Answer:
The correct answer is D. The state of Montana is about the size of the area of the Amazon that was cleared between 1990 and 2010.
Explanation:
Deforestation is the main problem that threatens the ecological stability of the Amazon jungle, generating through the reduction of forest land contamination, extinction of native species, alteration of ecosystems and many other damages to the environment.
It is calculated that more than 18,000 square kilometers of jungle are cut or burned annually, which, projected over 20 years, gives more than 360,000 square kilometers in which the Amazon jungle has been reduced due to human action. This amount of territory can be compared with the extension of the state of Montana, which has an area that exceeds 380,000 square kilometers.
The fact that the Mayans were building great buildings in their period of existence, is a proof that they had a very big political power in the region, and not just political, but also military, economic, cultural power.
Only civilizations that are strong, well organized, and political powerhouses, have been able to build such big structures, because they had the conditions and time for it. For building such big structures, lot of wealth is needed, also lot of workers, and great engineers. The Mayans had it all. They had great engineers, the labor force was provided in general by the slaves, or by the the tribes that they were ruling over, and from all the tributes paid to them by the people they ruled over, they had surplus of wealth, which meant that they can perform such activities without damaging the empire.
Answer:
Valencian town of Buñol, in the east of Spain