An increase in the concentrations of greenhouse gases in earth's atmosphere would have which of these effects on temperature? a. a decrease in average temperatures on earth's surface b. an increase in average temperatures on earth's surface c. an increase in average temperature in the upper atmosphere d. a decrease in average temperature within all earth systems

Aremote community desperately needs more electrical energy. it is located in an area with the following characteristics: average wind speed of 15 – 20 km/hr some medium-sized rivers with slow-moving currents few coal deposits some oil exploration being conducted within 400 miles based on the above information, which energy source would be the most economical and safest for the community to pursue? a. fossil fuel b. hydroelectric c. nuclear d. wind