Teacher:You are given a sentence in Spanish. Your job is to translate the Spanish sentence into English.
Teacher: Now, understand the problem? Solve this instance: Los países desarrollados reconocen que tienen una responsabilidad importante no solo de controlar sus emisiones de CO2 y a parte de la degradación a la que contribuyen en el mundo sino también la de marcar tendencia en I + D.
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Developed countries recognize that they have a real, important responsibility not only just to manage their CO2 emissions and some of the degradation that they're contributing to the world, but also as trendsetters in R & D.