Australia's renewable energy certificate scheme requires electricity retailers to sell a certain number of annual gigawatt hours of renewable energy, increasing on a growing trajectory. (solarpaces.org)
This chart shows the major sectors of the power - generation portfolio of the US in gigawatt hours generated annually: note the dynamic between coal (black line) and natural gas (red line). (businessinsider.com)
The research concludes  that taken together, fossil - fueled facilities are about 17 times more dangerous per gigawatt hour of electricity produced to birds than wind and nuclear power stations. (savetheeaglesinternational.org)