Shifting to 100% renewable energy sources for over 100 countries could be possible by 2050, according to a study by an international team of researchers. The study looked at how 139 countries — responsible for over 99% of world-wide carbon dioxide emissions — could be powered entirely by wind, water, and sunlight by 2050, and would generate 24 million long-term jobs, lead to a decrease in deaths from air pollution by 4 to 7 million, and savings of over US$20 trillion in health and climate costs. The team, led by researchers from Stanford University in the U.S.A., examined each country's electricity, transportation, heating/cooling, industrial, and agriculture/forestry/fishing sectors, and concluded that the increased uptake in renewable energy technologies would eliminate oil, gas, and uranium use, and the energy associated with mining, transporting and refining these fuels, and reduce international power demand by around 13%. The wholesale changes in energy infrastructure would also mean that countries would not have to depend on each other for fossil fuels, reducing international conflicts over energy. To find out more check out 100% Clean and Renewable Wind, Water, and Sunlight All-Sector Energy Roadmaps for 139 Countries of the World.