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).
An estimated 2.3 million people worldwide currently work either directly in renewables or indirectly in supplier industries. The solar thermal industry employs at least 624,000 people, the wind power industry 300,000, and the solar PV industry 170,000. More than 1 million people work in the biomass and biofuels sector, while small-scale hydropower employs 39,000 individuals and geothermal employs 25,000.