Prince Charles, a lifelong environmentalist who has championed organic gardening and runs one of his cars on white wine and cheese, has urged world leaders to turn talk into action at the upcoming UN climate summit.

Queen Elizabeth II's eldest son and heir, 72, is due to attend events at the two-week COP26 summit in Glasgow starting on October 31, along with his 95-year-old mother.

But in an interview with the BBC broadcast on Monday, he said he worried that world leaders would "just talk", adding: "The problem is to get action on the ground."

The UN summit will try to persuade major developing economies to do more to cut their carbon emissions, and get the rich world to cough up billions more dollars to help poorer countries adapt to climate change.

When asked if Prime Minister Boris Johnson's UK  government  was  doing enough itself against climate change, Charles replied:  "I couldn't possibly comment." 

Johnson on Monday held talks with his Indian counterpart Narendra Modi, and directly urged him to do more to cut emissions.

India is the world's third-highest emitter of greenhouse gases and relies on coal for nearly 70 percent of its electricity generation.

But it is resisting international pressure to set a target date for emissions to reach net zero, arguing the onus is on richer countries with higher emission rates per capita.

Johnson "underlined the importance of making concrete progress on climate change" before and at the Glasgow summit, Downing Street said in a statement.

"He noted that India already lead the world in renewable technology and expressed his hope that they will commit to a more ambitious Nationally Determined Contribution and to achieving Net Zero emissions," it added.

- Protests -

The Prince of Wales warned that the failure to act would have dire consequences, saying the world had taken "far too long" to take climate change seriously.

The summit aims to secure new commitments to reduce carbon emissions to prevent runaway global warming.

"The risks now are so great if you don't make the right move. It'll be catastrophic," he said. 

"It is already beginning to be catastrophic, because nothing in nature can survive the stress that is created by these extremes of weather."

He expressed sympathy with climate protesters, who have been blocking roads in Britain for several weeks as part of a campaign to make homes more environmentally efficient.

"I totally understand the frustration," he said, as the government tries to get tough with the demonstrators, who have caused gridlock to rush-hour traffic with sit-down protests and by glueing themselves to tarmac.

"All these young people feel nothing is ever happening so of course they're going to get frustrated," he added, stressing: "But it isn't helpful, I don't think, to do it in a way that alienates people. 

"So I totally understand the frustration, the difficulty is how do you direct that frustration in a way that is more constructive rather than destructive."

Charles, whose Highgrove estate in western England has an entirely organic garden and farm, also outlined some of his own actions to reduce his carbon footprint, including cutting down on meat and fish.

In 2008, his office revealed he had converted an Aston Martin car he owns to run on biofuel made from surplus English white wine and whey from cheese manufacturing.

Other cars in his fleet had been adapted to run on biodiesel made from used cooking oil, as a way to reduce his carbon footprint.