The first is that every human activity, serious or playful, eventually ramifies into a world of its own, a self-contained cosmos of enormous complexity.
Machen added that "some investigations are continued for many years because, while the evidence is not yet sufficient to bring charges, it is sufficient to have identified criminal subjects and/or criminal activity serious enough to justify continuation of the investigation".
The United States and its allies must do all they can to stop such activities, including serious diplomatic warnings.
He also emphasized that Iran's suspected nuclear weapons program and its support for "terrorist activities" were serious concerns.
Senator Arlen Specter, the Pennsylvania Republican who heads the Judiciary Committee, said the reported data-mining activities raised serious constitutional questions.
Landscape fragmentation associated with human activities poses serious threats to conservation of the Earth's natural ecosystems.
Unique features of the Arctic region, such as sub-zero temperatures and glacial activities, pose serious risk to ships.
Abstract: Providers of high-speed Internet access, including Verizon and the cable industry, are arguing that limitations on their activities raise serious constitutional concerns under the First Amendment.
They said: "Reliance on secret law to conduct domestic surveillance activities raises serious civil liberty concerns and all but removes the public from an informed national security and civil liberty debate".
