Be afraid. Be very afraid. Al-Qaida has revived, spread and is capable of a spectacular

[Horse with no Name]

http://www.guardian.co.uk/alqaida/story/0,,2167923,00.html
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Al-Qaida has revived, extended its influence, and has the capacity to carry out a spectacular strike similar to the September 11 attacks on America, one of the world's leading security thinktanks warned yesterday.

There is increasing evidence "that 'core' al-Qaida is proving adaptable and resilient, and has retained an ability to plan and coordinate large-scale attacks in the western world despite the attrition it has suffered", said the London-based International Institute for Strategic Studies (IISS). "The threat from Islamist terrorism remains as high as ever, and looks set to get worse," it added.

Old news.
But buried at the bottom is what we should REALLY be fearful of:

>>>snip
Climate change was also identified by the institute as a huge threat to global security. "Even if the international community succeeds in adopting comprehensive and effective measures to mitigate climate change, there will still be unavoidable impacts from global warming on the environment, economies and human security," said the report.

The report said the effects of the predicted rise in global temperatures due to the burning of fossil fuels would cause a host of problems including rising sea levels, forced migration, freak storms, droughts, floods, extinctions, wildfires, disease epidemics, crop failures and famine.