Environmental security is one of the modern security concerns that has gained cognitive, academic and even strategic recognition of its importance in view of the negative repercussions of climate change and global warming the world is witnessing. Because of an external aggression or a nuclear attack, but because of the high sea level that threatens to sink and disappear from the world map, such as the Maldives, Kiribati, Tuvalu, and others, and giant cities in major countries are also threatened with drowning, such as New York, London, Amsterdam, Shanghai, and others, in addition to the threat of climate change to food security Many countries, especially in Asia and South Asia, which are the most affected regions From the global environmental deterioration, and if the first and supreme goal of the state, according to realists, is survival, then what affects the environment today in terms of deterioration and decline is likely to be among the main threats to the survival of states in today's world, and therefore environmental security is closely related to the national security of states.

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Climate change, deforestation, pollution, over-population (the problems that occur in the domain of environmental security) __ they all affects quality of life. And whatever harms the quality of life or reduces choices, becomes a threat for national security.

And it is woven into basic fabric national security, in a complex way. For example, if any nuclear tragedy happens (God Forbid), it won't only result in degradation of the environment, radioactive bloom and deaths, but it will also disturb the climate patterns, water passages; will contaminate the land and make it a waste for any potential irrigation for quite significant time. Resource depletion would increase tensions and double the conflict over them. Moreover, it would create massive social and economic instability, increase the chances of more collisions and terrorism that at the end of the string, would harm the national and global security.

Variables can be Climate change, Biodiversity loss and resource depletion and environmental disasters. Any little change in them can overall set or alter the trend of decisions or policy of national security of a country.

Hope this helps :)

Environmental security is closely related to national security, as it affects several aspects of it.

Environmental security mainly deals with climate crisis and pollution.

Climate crisis results in the increase of migration flows (either due to the extreme rise of the temperature or the increase if sea level for coastal states) which affects the demographics of a state, a variant of its internal national security.

Pollution results in the decrease of fisheries which affects the trade and economy of a state, variants of its economic security.

Environmental changes can also lead to the re-emergence of diseases and the wide spread of it in the form of pandemics, so it affects public health the major variant of health security.

All the above are only some of the variants.