Blue Planet gives super-rich their new toys – submersibles

World’s ultra-rich are buying subs for up to £30m to indulge in deep ocean exploring

Green news roundup: wildlife decline, solar in India and 35,000 walrus

The week’s top environment news stories and green events

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Budget cuts threaten Kew Gardens’ world-class status

Up to 125 jobs to go at botanic institution after ministers impose £1.5m cuts despite warning of critical impact on research