Fuel Sources have a major impact on green house gas emissions, currently around 80% of are electricity generated is done through non renewables such as coal, natural gas, nuclear, and other fossil fuels.

However, renewable energy sources (and nuclear) are more efficient in terms of environmental impact and long-term costs compared to fossil fuels.

The biggest issue renewables face besides their high start up cost, is the size needed to build them (along with lower energy density) as it currently takes up at least 10 times the land (solar and wind) than that of fossil fuels.

Even with these drawbacks renewable is the future and more and more progress is being made every day, with an inevitable future relying mostly on nuclear and renewable energy by 2050.