This Calculator should be used as an estimating tool ONLY. 1  Enter the dimensions below to calculate how many bags of concrete you need. After entering the dimensions of the pad, click on Calculate and the calculator will provide you with the amount of concrete. 2  ft in. 3  ft in.  ft in.
According to the International Renewable Energy Agency (IRENA), renewable energy employment in the United States reached 724,000 jobs in 2014, a 16 percent increase from the previous year (IRENA does not include large-scale hydropower in their estimates).
7% of our total energy use comes from renewable energy sources, such as wind, solar, and hydropower. Renewable energy sources lessen our dependence on foreign energy and do not emit greenhouse gases. Experts predict that over the next two decades, renewable energy will provide a growing portion of U.S. overall energy.