Direct uses of solar radiation Indirect/Less direct uses of solar radiation Hydroelectric W Ind energy Biomass Renewable Ocean thermal gradients Energy Ocean currents Ocean waves Ocean tides Geothermal resources 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan UniversityDirect uses of solar radiation Indirect/Less direct uses of solar radiation Hydroelectricity Wind energy Biomass Ocean thermal gradients Ocean currents Ocean waves Ocean tides Geothermal resources Renewable Energy