Direct uses of solar radiation Indirect less direct uses of solar radiation Hydroelectricity Wind 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