Starving from Nuke exchange isn't our greatest threat.

A nuke exchange could cause two billion to starve, but so could an asteroid, a mega solar flare, a virus that affects only wheat or rice.  An accidental or intentional release of weaponized small pox virus could kill twice that many.   And that (or some other engineered biological weapon) is a far more likely to happen than a nuclear exchange. 

Every day over 17,000 children under the age of 5 die from easily preventable malnutrition and infections and virtually no body but their parents care.   

This ‘study’ is nothing more than a PR project by anti nuke folks who have no clue regarding the far greater threat of other WMDs.  Even with no nukes in the world our future looks grim primarily because we still think war is an option. 

Short of the second coming of Christ there is only one other possibility for humans averting such a lethal future.  Our decision to replace the law of force with the force of law.   A world federation may seem an impossible dream…but the real naivety is to believe human civilization can continue without giving up the primacy of national sovereignty (the right of any nation to do what ever it wants, when ever it wants to whom ever it wants).   

“World federation is an idea that will not die. More and more people are coming to realize that peace must be more than an interlude if we are to survive. That peace is a product of law and order; that law is essential if the force of arms is not to rule the world. “ Justice William O. Douglas

"Government is instituted for the common good; for the protection, safety, prosperity, and happiness of the people; and not for profit, honor, or private interest of any one man, family, or class of men; therefore, the people alone have an incontestable, unalienable, and indefeasible right to institute government; and to reform, alter, or totally change the same, when their protection, safety, prosperity, and happiness require it." -- Alexander Hamilton, Federalist No. 22, December 14, 1787