Countdown to Doomsday originally aired early 2006. It is about what could cause Doomsday on Planet Earth, can we prevent it and what about the future? It goes over the 10 threats, and 10 solutions:

10 Volcanoes
http://www.dailymotion.com/video/x12fj9_countdown-to-doomsday-volcanoes
9 Alien Attack
http://www.dailymotion.com/video/x12fw8_countdown-to-doomsday-alien-attack
8 Robot Rebellion
http://www.dailymotion.com/video/x12g35_countdown-to-doomsdayrobot-rebellio
7 Mass Extinctions
http://www.dailymotion.com/video/x12glp_countdown-to-doomsdaymass-extinctio
6 Solar Flares
http://www.dailymotion.com/video/x12grg_countdown-to-doomsday-solar-flares
5 Terrorism
http://www.dailymotion.com/video/x12h0j_countdown-to-doomsday-terrorism
4 Global Warming
http://www.dailymotion.com/video/x12hdw_countdown-to-doomsdayglobal-warming
3 Gamma Ray Burst
http://www.dailymotion.com/video/x12hl2_countdown-to-doomsday-gamma-ray
2 Pandemic
ttp://www.dailymotion.com/video/x12iao_countdown-to-doomsday-pandemic
1 Deep Impact
http://www.dailymotion.com/video/x12iil_countdown-to-doomsdaydeep-impact

And recently in the news Jan 17 2007:
Two Minutes Closer To Doomsday?
Scientists Push Forward Doomsday Clock Amid Fears Of Nuclear Weapons And Global Warming
Link: http://www.cbsnews.com/stories/2007/01/17/tech/main2366813.shtml

Nuclear, climate perils push Doomsday Clock ahead
Source: Reuters
http://www.alertnet.org/thenews/newsdesk/N17314370.htm