One half of the worlds energy comes from what source

a. hydroelectric power

b. fossil fuels

c. nuclear energy

d. solar energy

Fossil fuels today account for 80 percent of global primary energy demand. Despite lowering costs for renewable energy, developing countries continue to invest in coal to ensure uninterrupted power supply and support their industry. As a result, global coal use is expected to grow slowly in the coming years despite declining demand in the US and Europe.