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Green Investors Buy Pollution Allowances in Bet on Tighter Rules

  • Emissions market tracking stocks is a sign of investor return
  • Supply is expected to tighten in coming years, boosting prices
Cooling towers in Germany.
Cooling towers in Germany.Photographer: Krisztian Bocsi/Bloomberg
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Carbon speculators have probably returned to a market that’s set to be squeezed by the European Union’s climate ambitions.