Как были определены цифры 2 и полто

Как были определены цифры 2 и полтора градуса в Парижском соглашении и из-за чего возникла такая разница?

Результаты (английский) 1:

Both figures were identified 2 and a half degrees to the Paris agreement and which arose such a difference?

Результаты (английский) 2:

As identified figures 2 and a half degrees in the Paris Agreement, and which is why there was such a difference?

Результаты (английский) 3:

as the identified numbers 2 and 90 degrees in the paris agreement, and what is the difference?