1. A market-based trading scheme for rights to emit greenhouse gasses that contribute to global warming
   - emission trading scheme

Encyclopedia: ETS

• Pontos
• Pontus
• pony
• pony express
• pony up
• pony-trekking
• ponycart
• ponytail
• poo
• poo-poo
• pooch
• pooch out
• pood
• poodle
• poodle dog
• Pooecetes
• Pooecetes gramineus
• poof
• poofter
• pooh
• pooh-bah
• pooh-pooh
• pooka
• pool
• pool ball