"Think the ash cloud was bad?" ask Ploughshares Fund's Alexandra Bell [2] and Ben Loehrke [3]. "That's nothing compared to what would happen if India and Pakistan exchange just a few nukes."
Links
[1] https://ploughshares.org/file/1772
[2] https://ploughshares.org/../../../../../../../about-us/alexandra-bell
[3] http://www.good.is/community/Benloehrke
[4] http://www.ploughshares.org/news-analysis/blog/what-volcano-can-teach-us-about-nuclear-war