The world's population is now odds-on to swell ever-higher for the rest of the century, posing grave challenges for food supplies, healthcare and social cohesion.
Kuniko Tanioka, a member of the Japanese Parliament who traveled to Washington to research how the United States government conducts independent inquiries after major technological disasters, said that advising the public after a nuclear accident poses grave challenges in both countries.
In the Asia-Pacific region, if the United States makes use of resources from Australia, Chile and Canada, teams up with Japan and South Korea in high-end manufacturing, and offers support to Vietnam, the Philippines and Malaysia in low-end industries, it will inevitably pose grave economic and trade challenges to China.
Acid rain, industrial pollution, nuclear risks, and declining biodiversity also pose grave problems.
But his forceful new challenge poses grave risks for Mr. Kabila, who is weaker than ever.
That would pose a grave challenge to the government of President Bashar al-Assad, who has relied on security forces to crush an unprecedented popular revolt against more than four decades of iron-fisted rule by his family.
The vegetation component in the extended model, and indeed ecogeomorphic systems in general, pose even graver challenges to establishing appropriate state variables.
But bringing guns to class also poses grave risks.
The violence poses a grave challenge for Mr. Sharif, who was voted into power after the general elections and only recently took office.
By the end of the 60s the emergence of Palestinian factions intent on using terrorist tactics to force their cause on to the international agenda posed a grave challenge to Israel.
Depression in later life poses a grave challenge for the aging countries.
