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Lord Mandelson's intervention in the Labour leadership election has transformed the contest, according to several of Tuesday's newspapers.

the former business secretary has "upstaged" all the candidates, says the Daily Express.

The Daily Mail thinks he has by warning that electing Ed Miliband as leader would harm Labour.

The Times cartoon shows Lord Mandelson

'Hard to trust'

The Guardian's main story is that the world's most high-profile climate change sceptic, Bjorn Lomborg, is

It says he will declare that global warming is "undoubtedly one of the chief concerns facing the world today".

But the Daily Telegraph discusses the controversy over exaggerated claims by the UN's climate change panel.

It thinks if the word of a key body "cannot be trusted".

'Counterblast'

Several papers discuss the planned publication of Tony Blair's memoirs on Wednesday.

The Sun says it understands Mr Blair's book will make

"He won three elections, but he blames Gordon Brown for Labour losing power," the paper claims.

According to the Daily Mail, Mr Brown's friends have warned that they , and are preparing a "counterblast".

'Honest brokers'

There is much concern about the future of cricket following allegations of spot-fixing in matches.

writes Peter Roebuck, in the Independent, arguing the game needs "tough action and honest brokers".

The Daily Mirror's Oliver Holt says

"Looking disgusted is fine", he writes, but if English cricket is to react properly to this crisis it must look carefully at the influence of gambling on the sport.