COP26: Get serious about climate change or it will be too late - Johnson

"If we don't get serious about climate change today, it will be too late for our children to do so tomorrow," Prime Minister Boris Johnson has told leaders at the start of the COP26 summit.

Mr Johnson said the conference in Glasgow "must mark the beginning of the end" of climate change.

He was speaking to leaders from 120 countries ahead of tense talks.

The COP26 conference is seen as crucial if temperature increases, and changes to the climate, are to be limited.

The world is now about 1.2C warmer than it was in the 19th Century - and extreme weather events like heatwaves, floods and forest fires are already becoming more intense.

The 2015 Paris climate conference called for average temperatures to rise by well below 2C, and preferably only 1.5C, when compared to pre-industrial averages.

But unless more is done, the planet is already on track to warm by more than 2C by the end of this century.

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Speaking on Monday after a morning spent welcoming the world leaders to Glasgow, Mr Johnson said time was running out.

"The longer we fail to act, the worse it gets and the higher the price when we are eventually forced by catastrophe to act," he said.

"Humanity has long since run down the clock on climate change. It's one minute to midnight on that Doomsday clock and we need to act now."

The prime minister added: "If summits alone solve climate change then we wouldn't have needed 25 previous COP summits to get where we are today.

"But while COP26 will not be the end of climate change it can and it must mark the beginning of the end."

Prince Charles is the most senior royal at the conference, after the Queen was told to rest

Veteran broadcaster and environmentalist Sir David Attenborough also spoke to the leaders, and was given a standing ovation by US President Joe Biden.

Alongside a dramatic soundtrack and a video showing striking images of the planet, Sir David said: "Today, those who have done the least to cause this problem are being the hardest hit - ultimately all of us will feel the impacts, some of which are now unavoidable."

"We are already in trouble," he told them - but said he hoped they would be motivated by a "desperate hope" rather than fear.

"In my lifetime I've witnessed a terrible decline," said the 95-year-old. "In yours, you could and should witness a wonderful recovery."

And in his speech, Prince Charles also urged the world leaders into action, saying he understood that many countries could not afford to "go green".

Instead, he said, there needs to be a "vast military-style campaign to marshal the strength of the global private sector", which had trillions of dollars at its disposal, he said.

World leaders arrived at the Scottish Events Campus in Glasgow for the official opening on Monday morning. Later, they will make statements setting out what their countries are already doing on climate change.

The venue has officially become United Nations territory for the summit - with high levels of security to get in and patrols by armed UN officers.

Some people have criticised the amount of air travel the conference was generating, as estimates suggested hundreds of private planes had flown into Glasgow.

But Foreign Secretary Liz Truss earlier defended the decision to host world leaders in person, saying face-to-face talks were needed for "crunch negotiations" such as this.

Scotland's First Minister Nicola Sturgeon said she understood that the air travel involved may send a "mixed message" - but agreed that more progress is made when leaders meet in person.

"Given all of the travel required to get here, it even further increases the pressure on the shoulders of world leaders to make sure it's worth it," she said.

The COP26 global climate summit in Glasgow in November is seen as crucial if climate change is to be brought under control. Almost 200 countries are being asked for their plans to cut emissions, and it could lead to major changes to our everyday lives.

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