"The only hindrance of using more renewable energy resources in future could be the finances to install the required technologies" (Adra, 2014). Your answer: As claimed by Adra (2014), in the future, economic reasons could be the main obstacle to use further renewable energy resources since more investors in technology are needed. Adra (2014) points out that investments in technologies to use renewable energy resources in the future may only be prevented due to insufficient financial resources. Adra (2014) claims that particularly, economic interferences in terms of using further renewable energy resources in the future could not prevent the investments in technologies. Adra (2014) argues that the use of more renewable resources could depend on financial rivalries to set up the needed technologies in the future