01' the atonic bomb that levelled Hiroshima, and there is in principle no upper l-imit to the explosive yield that nay be attained. The total strength of p"esent nur:l-ear: arseoals may be equivalent to about I' uiJ-lion Hiroshima bonbs, i'e'" sone 1-1,000 rnillion tons of TllT, ft is often pointed out that tlLis is equivalent to nore th6.n 3 tons for every mani woman and child on the earth' The arsenals of the United States and the Soviet Union contain most of these weapons, vith the knovn renaind.er belonging to China, France and the United [ingdon. 10. A measure of the resources cl-aimed by nuclear-veapon progralnmes is the aniJunt of natural uranium they consume. It is estirnated that )+ to 5 per cent of the uranil& believed to be available in the ground in the united states and Canada (between 2 and 3 nillion roetric tons) has 8.1ready been Frocessed for the extraction of enriched uranir::n-235 for military nurTroses, Additional ttranium has been convetted to plutonir:n, of vhich the bulk so far has been used to fabricate nuclear weapons. 11, In terms of defence expenditure, the bud.g€tary demands for equiprnent and Labour to na.he these vast murbers of nuclear varhead.s are now stated to be in the range of $2,000 to $2,500 million aanually for the United. States enal believed to be about the sane for the Soviet Union. This may be less than 1 per cent of tbe total defence budgets of the two super-Powers, but the delivery systsrs cl-ain 10 tines as much and when researeh and developnent costs are included, the anount for nucl,ear forces cones to about 20 per cent of the entire defence budget, accortling to United States estimates. A. fhe nuilear weapog L2, The energy released by a nucfear weapon originates in the nucleus of the
**Analysis**
The text appears to be discussing the topic of nuclear weapons and their impact on society, specifically in terms of their destructive power, the resources required to produce them, and their cost. It does not seem to be related to economic development, natural resources, agriculture, forestry, fishing, or humanitarian aid. The text does not have a direct connection to culture, education, employment, or health. The focus on science and technology is evident, but it is not the primary category. Transport and communication are not relevant to the topic.

**Category**
Science and Technology, International Affairs