Enviros urge Obama to reverse course, support EU aviation carbon tax The World Wildlife Fund digs up five Nobel Prize laureates for a letter to the White House. Click for the WWF letter. Share this: Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook More Share on LinkedIn (Opens in new window) LinkedIn Share on Pinterest (Opens in new window) Pinterest Share on Tumblr (Opens in new window) Tumblr Share on Reddit (Opens in new window) Reddit