Newspaper headlines: Sir David Attenborough and Chris Grayling on front pages

Apocalyptic front-page headlines stress the urgency conveyed by broadcaster Sir David Attenborough in his speech to the UN climate conference.

"Our planet is on the brink of destruction," is the Mirror's take, while the i sums things up with the headline: "Act now - or face the collapse of civilisation."

But it's the state of the UK's railways that preoccupy other papers.

The Times describes as "damning" a report suggesting Transport Secretary Chris Grayling should accept personal responsibility for the "meltdown" of rail timetables over the summer.

MPs found that Mr Grayling was at "the apex" of the system and had the power to halt timetable changes that led to the cancellation of at least 780 trains a day, the paper reports.

Meanwhile, the Financial Times says London's Crossrail project is to demand hundreds of millions of pounds more from the government, in what would be its third bailout of the year.

The FT says ministers were furious in August when Crossrail's management admitted that its completion would be delayed by a further year.

In its editorial - headlined "going off the rails" - the Daily Mail notes further problems with the HS2 plan for a faster line between London and Birmingham, and later northern England. It criticises the "lamentable lack of leadership" on the rail network.

Mick Whelan, from the train drivers' union Aslef, tells the i that Mr Grayling should resign.

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The attorney general's admission that the UK could not unilaterally withdraw from the proposed Brexit "backstop" arrangement with the EU is described by the Daily Telegraph as "a significant blow to Theresa May".

It says Geoffrey Cox's statement will make it harder to win over more than 100 potential Tory rebels ahead of next week's Commons vote on the EU withdrawal agreement.

In its editorial, however, the Daily Mail welcomes what it calls a "dose of Brexit pragmatism". It was a "masterful performance" from Mr Cox, the paper says, which acknowledged there were compromises involved but accepted Mrs May's deal was the "best available".

The Daily Express draws a very different conclusion. It says the prime minister needs - privately at least - to accept the vote might not go her way, and offers her a solution: prepare for a no-deal Brexit and "walk with our heads held high".

The Independent online newspaper, meanwhile, reports that petitions carrying the names of almost 1.5 million people demanding a further referendum were handed in to Downing Street on Monday. The pro-Remain campaigner, Alastair Campbell, says even in these "clicktivist days", such a high number is eye-catching.

HuffPost UK says it's seen a letter published by Education Secretary Damian Hinds, calling on universities to do more for students struggling with their mental health.

Universities should be more proactive when it comes to sharing students' emergency contact details with their loved ones, the letter reportedly says.

A recent investigation by the website found only two of the UK's 20 top universities currently have such a policy.

Meanwhile, according to new health advice reported in the Telegraph, medical professionals should consider prescribing weightlifting and protein powders to the elderly.

Scientists in Dublin say an ageing society means there is an increasing number of frail people. Muscle strength training and supplements appear to be the best ways of mitigating it, it reports.