Look at the essay statement and these two introductions. What introduction is more successful?
Global environmental issues are the responsibility of richer nations, not poorer ones.

• The problem of the environment all over the world arouses much controversy nowadays. Some people think that only wealthier countries should be responsible for environmental protection, while others consider that poorer countries should also take actions.

• The problem of the environment has always aroused heated debates. Some people think that global environmental issues are the responsibility of richer nations, not poorer ones, while others don’t agree with this statement.