Every year around this time in Japan a Kanji character is chosen that best represents the year that is ending. The character is presented in the public in a ceremony in Kyoto, Japan in which a Buddhist monk writes the character in 習字 (Japanese calligraphy).
This past summer had record high temperatures in Japan.
Also from August until October, miners in the country of Chile were trapped underground where the temperature was often over 30°C.
And Japan sent an unmanned space probe into space to take samples of an asteroid. Upon it’s return to Earth, most of the capsule was destroyed in the re-entry temperature of over 10,000°C.
For these reasons it was decided that the Kanji character that represents 2010 is 「暑」, which means “hot“.