Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
French security agents, innocent or otherwise of the sinking of Rainbow Warrior, have done more for Greenpeace than any other publicity stunt has done. Not only France will suffer.
A new calculation shows that smoke from nuclear conflagrations will reach the Southern Hemisphere from a northern nuclear war, especially in the northern summer. But many other problems persist.
