A．The temperature began to increase much faster.
B．Europeans experienced extreme hot weather.
C．Hot weather became more frequent all over the world.
D．Global warming produced heat wave in many countries.
A．Exceptional weather events．
B．Every year's new weather records.
C．The pace of global warming.
D．The weather condition worldwide.
A．It is a kind of social problem.
B．It has a bad impact on mental health．
C．It makes people less effective at work.
D．It troubles most people nowadays.