Foremost among the Grand Challenges we face are those that must be met to ensure the future itself. The Earth is a planet of finite resources, and its growing population currently consumes them at a rate that cannot be sustained. Economical sources of clean and renewable energy must be found while ways of reducing carbon emissions from fossil fuels are developed. Engineers must also design countermeasures for disruption of the nitrogen cycle, while maintaining the ability of agriculture to produce adequate food supplies. And, while modern technologies can provide access to clean water, this remains a major problem in many parts of the world.
Keith Clarke - Same challenges with Bigger Answers or a DIfferent Question
Robert Socolow - Fitting on the Earth: Grand Challenges to Preserve the Habitability of the Planet
QIAN Yi - Sustainable Management of Urban Water Resources