In the passage, the author implies that______.A．the world has recently become aware of the

In the passage, the author implies that______.

A．the world has recently become aware of the threat of global warming

B．the problem of global warming has largely been solved

C．it is not easy to work out international agreements to cut down harmful emissions

D．it is no longer easy to reach international agreements relating to the environment

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！