MechScience: For mechanician & mechanical science

After making a list of the great engineering achievements of the 20th century, the National Academy of Engineering, of the United States, has recently described a list of the grand challenges for engineering in the 21st century (of no particular order):
Make solar energy economical
Provide energy from fusion
Develop carbon sequestration methods
Manage the nitrogen cycle
Provide access to clean water
Restore and improve urban infrastructure
Advance health informatics
Engineer better medicines
Reverse-engineer the brain
Prevent nuclear terror
Secure cyberspace
Enhance virtual reality
Advance personalized learning
Engineer the tools of scientific discovery
Update on 27 April 2008. The US National Committee on Theoretical and Applied Mechanics would love to hear your thoughts on these challenges.
More detail about the subitemhttp://www.engineeringchallenges.org/cms/challenges.aspx