Terrorism is a significant threat to peace and security, prosperity and people. Ban Ki-moon
Greenhouse gas pollution, through its contribution to global climate change, presents a significant threat to Americans health and to the environment upon which our economy and security depends. Gina McCarthy
The avian influenza found in mainland British Columbia poses no significant threat to human health. John Clifford
I think malware is a significant threat because the mitigation, like antivirus software, hasn't evolved to a point to really mitigate the risk to a reasonable degree. Kevin Mitnick