Those same voters are also bracing for tax rises in the upcoming budget after pitch rolling earlier this week by Chancellor Rachel Reeves. But Sir Keir pencilled in the last minute dash to the rainforest following a surge in polling support for the Green Party.

The UK’s secret weapon was deployed – Royalty in the form of Prince William who was representing the King –- at the same time as the Government is said to be considering rolling back on some of its climate commitments.

The Labour leader does not only have his left flank to worry about politically. There is also the growing threat of Nigel Farage on his right. Sir Keir has rejected the Reform UK leader’s net zero attacks by insisting the Government would press ahead “full speed with the clean power revolution”.

But he has faced accusations that ministers are undermining UK businesses by having some of the most expensive industrial energy globally. Mr Farage’s party often blasts “net stupid zero” while Tory leader Kemi Badenoch has pledged to repeal the Climate Change Act and insists net zero by 2050 is “impossible”.

Sir Keir’s determination to go full steam ahead on the planet is also at odds with his ally across the pond – Donald Trump. And while the US President did not attend this meeting in Belém, his views on climate change are certainly on the minds of other leaders who attended.

Speaking at the UN in September, Mr Trump said that climate change was “the greatest con job ever perpetrated on the world”.

He said: “The entire globalist concept, asking successful industrialised nations to inflict pain on themselves and radically disrupt their entire societies, must be rejected completely and totally.”

Wind energy is an “expensive joke”, Mr Trump said on a recent trip to the UK where he urged Sir Keir to exploit the “great asset” of North Sea oil and gas.

There are concerns that the US risks disrupting international cooperation on climate action at the Brazil summit.

A landmark deal to cut global shipping emissions was abandoned recently after Saudi Arabia and the US succeeded in ending the talks.

More than 100 countries had gathered in London to approve a deal first agreed in April, which would have seen shipping become the world’s first industry to adopt internationally mandated targets to reduce emissions.

But US President Donald Trump had called the plan a “green scam” and representatives of his administration had threatened countries with tariffs if they voted in favour of it.

Despite this, Starmer’s government is sticking to its 2050 net zero target even as right-wing rivals retreat from it.

Simply by turning up at COP30, the PM has aligned himself with a global climate agenda that feels increasingly fragile.

Many leaders from the world’s most polluting nations – such as India, Russia, US and China – were notably absent from this year’s world leaders’ summit.

The conference, which officially begins on Monday and runs until November 21, was first billed as a major nature COP – which stands for conference of the parties – but a swathe of accommodation issues and sky high prices means it could fail to have the impact many in the green world had hoped.

Meanwhile Government officials have insisted Sir Keir’s decision not to take a full press pack was purely logistical and had nothing to do with making fewer headlines back in the UK.

It means in a week of major stories, the Prime Minister has hardly been held to account too.

The issues in his intray as he touched down back in Britain yesterday (FRI) include: a manhunt for a migrant sex offender mistakenly released from prison, a looming Budget with a massive tax raid expected to clobber millions of Britons in less than three weeks time.

The small boats crisis, tariffs and rising unemployment are a major headache for the Prime Minister too.

Ultimately, at the heart of the yearly climate summit is a determination to save the planet.

The failure to limit global heating to 1.5C above pre-industrial levels is a “moral failure and deadly negligence”, the UN secretary general has said at the opening session of COP30.

António Guterres said even a temporary overshoot would have “dramatic consequences.

It could push ecosystems past catastrophic tipping points, expose billions to unlivable conditions and amplify threats to peace and security, he warned.

The driver behind adapting and mitigating for the fight against global warming and ecological destruction is money.

Sir Keir is green-minded but only when his Chancellor allows it.

The UK will not contribute public money to a flagship tropical forests fund which Brazil wants to make a centerpiece of its climate summit.

A spokesman for the Department for Energy Security and Net Zero insisted the UK was “incredibly supportive” of Brazilian President Luiz Inácio Lula da Silva’s initiative, known as the Tropical Forests Forever Facility (TFFF), but that support would continue with “efforts to unlock private investment.”

It seems the Treasury won the Whitehall battle over the financial backing of the $125 billion (£95billion) fund.

Zac Goldsmith, who was the Tory Environment Secretary when the TFFF was being set up, said on X that Sir Keir has “pulled the plug” on supporting “the first realistic mechanism to save the world’s forests”.

This all comes as 2025 is set to be one of the hottest years on record.

The world has just witnessed the devastation caused by Hurricane Melissa in Jamaica.

People died from flooding in New York earlier this month.

And nature is declining at unprecedented rates, with as many as a million species facing extinction.

The parties that make up COP refer to the nearly 200 countries that have signed up to the original UN climate agreement of 1992.

They will all attempt to unite over the next two weeks to pull together a document with a roadmap for saving the planet.

Even as the consensus cracks, nations in Belém will try to find common ground.

The stakes could hardly be higher – both politically and for the planet.