A．It will take a long time before a consensus is reached on its impact.
B．It would be more costly to deal with its consequences than to avoid it.
C．It is the most pressing issue confronting all countries.
D．It is bound to cause endless disputes among nations.
A．The transition to low-carbon energy systems.
B．The cooperation among world major powers.
C．The signing of a global agreement.
D．The raising of people's awareness.
A．Carry out more research on it.
B．Cut down energy consumption.
C．Plan well in advance.
D．Adopt new technology.
A．When luck plays a role.
B．what determines success.
C．Whether practice makes perfect.
D．How important natural talent is.