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A BMW-backed student EV packs 1,700 solar cells and finishes a typical urban commute with more charge than it started. Deep Orange 17 is designed to generate surplus energy from daily driving.

Berkshire Hathaway earnings rose last quarter as gains in energy, railroad and manufacturing businesses offset weaker insurance results. CEO Greg Abel has begun deploying the company's large cash reserves.

Rivers across Europe are drying up, forcing drastic measures that are hitting energy production and economies.