as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
identify the main idea of the following write-up: 

global warming is an issue of great concern in today's world, with many powerful countries taking action to fight the problem.
user
the main idea of the write-up is that global warming is an issue of great concern and many powerful countries are taking action to fight it.
assistant