a. On the contrary, most scientists agree that it is real and that we need to do something about it. b. They say it is just a natural part of the Earth's climate.

a. On the contrary, most scientists agree that it is real and that we need to do something about it.

b. They say it is just a natural part of the Earth's climate.

c. However, some people think that global warming is not real.

d. Global warming is causing a lot of problems for the world.

e. The temperature of the Earth is slowly getting hotter, and this is causing the ice at the North Pole to melt.