The most serious problems facing the world are problems of global security that can be addressed only by global cooperation. The human species is threatened by weapons of mass destruction, the pollution of the environment, and poverty on a massive scale. With advances in science and technology and modern communication technologies, people are thinking in global terms. Finance, business, trade, tourism, culture and sport are all international activities. As in the course of history we developed a loyalty to our family and nation, we, as Joseph Rotblat argues, must now take the final step and develop an allegiance to humanity.