Final answer:
The author supports the claim that the world's current supply of nuclear weapons is not secure by highlighting the dilemma of whether to modernize or reduce them, the potential for accidental use, and the possibility of weapons malfunctioning.
Step-by-step explanation:
In the article "The World Doesn't Need More Nuclear Weapons," the author provides several sentences that support the claim that the world's current supply of nuclear weapons is not secure.
One sentence states, "For instance, will we further reduce our nuclear arsenals globally, or will we spend billions, maybe a trillion dollars, to modernize them so they last throughout the 21st century?" This sentence highlights the dilemma of whether to invest in modernizing existing weapons or reducing their numbers.
Another sentence states, "But at that time, Russian President Boris Yeltsin came within five minutes of launching a full-scale retaliatory nuclear attack against the United States." This sentence demonstrates the potential for accidental or impulsive use of nuclear weapons.
Finally, the sentence "In another case, the weapon did arm when it hit the ground, and five of the switches designed to keep it from detonating failed" illustrates the possibility of weapons malfunctioning and causing unintended detonation.