Can international climate agreements hold and be effective in the absence of a global hegemon(the USA)? if no, why?

Explanation:

It refer to global warming. The kyoto protocol is an international agreement that called for industrialized nations to reduce green house gases emission significantly. And also paris climate agreement, have also tried to curb global warming crisis. The kyoto protocol developed under United nations framework convention on climate change. ( UNFCCC)

The protocol encourages 192 parties to reduce their green house gases emission, with many developed countries having binding emission reduction targets.

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first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place