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The average temperature of the Earth is rising at nearly twice the rate it was 50 years ago. This rapid warming trend cannot be explained by natural cycles alone, scientists have concluded. The only ...

Update: This article has been updated with a comment from Mercedes-Benz. Just like cars and gadgets, battery technology evolves in phases. Sometimes you get breakthroughs, other times things get ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Erika Rasure is globally-recognized as a leading consumer economics subject matter expert, ...