Meet the guy who wants to help save the planet with thousands of buoys, seaweed and giant antacids

Marty Odlin, the CEO of Running Tide, wants to absorb carbon dioxide from the air and sea with a network of kelp-growing buoys. (Evelio Contreras/CNN) Marty Odlin, the CEO of Running Tide, wants to absorb carbon dioxide from the air and sea with a network of kelp-growing buoys. (Evelio Contreras/CNN)

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One scandal too many: British PM Boris Johnson resigns

Prime Minister Boris Johnson announced his resignation Thursday amid a mass revolt by top members of his government, marking an end to three tumultuous years in power in which he brazenly bent and sometimes broke the rules of British politics.

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