Here, negotiators from some 190 countries must strike a new global deal to tackle the challenge of climate change.

UNESCO: Communication and Information

That's the concept behind the Global Good Challenge, a new initiative to grab the Facebook generation's attention.

CNN: Turning global activism into a game

The Company is providing open access to this data as part of its PacX Challenge, a global competition seeking new ocean applications and research using the PacX data set.

ENGADGET: Liquid Robotics' Wave Glider breaks Guinness record, does it in the name of science

For the global community, climate change adaptation is a new challenge.

UNESCO: THEMES

The biggest challenge facing the new chairman is finding a global niche for Hyundai amidst a worldwide glut of production capability, which is a major motivator for high-profile mergers in the industry.

CNN: A NOVICE AT THE WHEEL

All invited students have indicated an interest in the Airbus Fly Your Ideas global student challenge, a competition where students develop new ideas for a more sustainable aviation industry.

UNESCO: Connecting with the next generation of innovators at Farnborough International Airshow Futures Day | United Nations Educational, Scientific and Cultural Organization

We must also not forget that with 33 million people living with HIV and 2.7 million new infections in 2007, the HIV epidemic continues to be a major global challenge.

UNESCO: World Water Assessment Programme (WWAP)

Two global media companies, the BBC and The New York Times, are dealing with that challenge right now...

BBC: Jimmy Savile scandal: Media reaction to BBC approach