Outgoing Director of Public Prosecutions Sir Ken Macdonald warned that the expansion of technology by the state into everyday life could create a world future generations “can’t bear”.

In his wide-ranging speech, Sir Ken appeared to condemn a series of key Government policies, attacking terrorism proposals - including 42 day detention - identity card plans and the “paraphernalia of paranoia”.

Instead, he said, the Government should insist that “our rights are priceless” and that: “The best way to face down those threats is to strengthen our institutions rather than to degrade them.”

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Ministers are considering spending up to £12 billion on a database to monitor and store the internet browsing habits, e-mail and telephone records of everyone in Britain.

GCHQ, the government’s eavesdropping centre, has already been given up to £1 billion to finance the first stage of the project.

A quarter of the world’s mammals are threatened with extinction, an international survey showed on Monday, and the destruction of habitats and hunting are the major causes.

The report, the most comprehensive to date by 1,700 researchers, showed populations of half of all 5,487 species of mammals were in decline. Mammals range in size from blue whales to Thailand’s insect-sized bumblebee bat.

More than half of all frogs, toads and newts living in Europe could be driven to extinction within 40 years as climate change, diseases and habitat destruction take their toll, scientists warned last night.

The majority of the most threatened species live in Mediterranean regions, which are expected to become warmer and drier. Island species, such as the Mallorcan midwife toad and Sardinian brook newt, are especially at risk because they are unable to move to cooler climates.