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

Encyclopedia: ETS

• Aspidophoroides
• Aspidophoroides monopterygius
• Aspinwall
• aspirant
• aspirate
• aspiration
• aspiration pneumonia
• aspirational
• aspirator
• aspire
• aspirer
• aspirin
• aspirin powder
• aspiring
• Aspis
• Aspleniaceae
• Asplenium
• Asplenium adiantum-nigrum
• Asplenium billotii
• Asplenium bradleyi
• Asplenium ceterach
• Asplenium montanum
• Asplenium nidus
• Asplenium nigripes
• Asplenium pinnatifidum