Is Climate Change True?

Kunihiko Takeda addressed the climate change would not be a large issue because the climate change would not be happened. He mentioned the temperature would not be higher for the long period, and the polar bears would decrease and so on. The media and politicians has made the large campaign for their profits.
I'm not sure whether his opinion is true or not. However, it's much important to save energies even if the climate change is happened.