Shifting the planet to a fully renewable energy portfolio is possible using current technology and without breaking the bank, according to a study. Researchers at the University of California, Davis, and Stanford University say that 4 million large-scale wind turbines and 90,000 solar plants would be needed to provide the world with clean energy, and that "government support" would be needed to make the industry cost-competitive with less clean energy sources. "Technically you can do it. It really depends on will power," says study co-author Mark Jacobson.
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