What should all countries do to help solve the problem of global warming？A．They should hol

What should all countries do to help solve the problem of global warming？

A．They should hold another world conference on climate change.

B．They should provide advanced technology.

C．They should replace all the harmful substances.

D．They should willingly undertake legal commitments about their energy uses.

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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