Samsung joins global pledge to increase renewable energy use

Samsung Electronics Co., the world's biggest smartphone maker, joined on Thursday a growing list of companies that are promising to increase their use of solar and other renewable energy to help curb global warming.

The right mix of green energy

Can we get by on just renewable energy? Can energy from the sun, wind and water cover our electricity needs – even on a windless, overcast day in Scandinavia? Perhaps, but it makes new demands.

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