•        Enhanced natural gas. Stephen Brown

•        Risks from asteroid collisions. John Anderson

•        Aviation taxation. Michael Keen and Jon Strand

•        HOV lane preferences for hybrid vehicles. Antonio Bento

•        Outdoor recreation. Juha Siikamaki and Margaret Walls

•        Food and biofuels. Ujjayant Chakravorty

•        GM crops. Matin Qaim

•        Ecosystem services. David Simpson

•        Highway finance. Martin Wachs

•        Low carbon fuel standard. Stephen Holland, Jonathan Hughes and Chris Knittel

•        Climate policy in Australia. Frank Jotzo

•        Feebates. James Sallee