The idea of global security emerged in:

1990

The correct answer is option (2) - 1990

The idea of global security emerged in the 1990s in response to the global nature of threats such as global warming, international terrorism, and health epidemics like AIDS and bird flu and so on. No country can resolve these problems alone. And, in some situations, one country may have to disproportionately bear the brunt of a global problem such as environmental degradation. For example, due to global warming, a sea level rise of 1.5–2.0 meters would flood 20 percent of Bangladesh, inundate most of the Maldives, and threaten nearly half the population of Thailand. Since these problems are global in nature, international cooperation is vital, even though it is difficult to achieve.