We delivered a clear message at Cop30: the delayers and defeatists are losing the climate fight | Ed Miliband

Sweaty, maddening, sleepless. That’s what it was like to be part of Cop30 in Brazil. And yet more than 190 countries came together in the rainforest of the Amazon and reaffirmed their faith in multilateralism, the Paris agreement and the need to redouble our efforts to keep global warming to 1.5C. We went to Cop because working with other countries to tackle the climate crisis is the only way to protect our home and way of life. We know the UK produces just 1% of emissions, which is why, as the prime minister said in Belém, our government is “all-in” on working with others to reduce the remaining 99%. We also know there are huge opportunities from driving the transition forward, which is why in Britain we are making historic investments in renewables and nuclear, upgrading millions of homes, and acting to protect nature. It is true that Britain wanted more from this Cop, including details of how we would speed up the global energy transition through an agreement that explicitly pledged a roadmap for the transition away from fossil fuels. This didn’t happen because some countries would not agree. Yet on this issue, we have seen the emergence of an impressive coalition of 83 countries from the global north and global south, backed by more than 140 global businesses and civil society groups. And Brazil will launch a roadmap to help countries transition away from fossil fuels and scale up clean energy. This offers such an important lesson: that detailed negotiations matter, but the movements we build around them profoundly influence what can be delivered. The roadmap to achieve our goal to halt and reverse deforestation by 2030 offers the same opportunity to drive forward our global efforts to tackle the nature and climate crises together. There is also a larger picture here. This year’s summit was a test of whether, at a time of political challenge, countries would keep working together on the greatest collective threat we face or, with the US stepping out of the Paris agreement, there might be a domino effect of others departing. For all the challenges, countries chose the path of cooperation. Cop30 therefore forms part of the long history of these negotiations that have seen the world change its trajectory from 4C of warming around a decade ago to 2.3- 2.5C. Despite that progress, our goal is 1.5C for a reason – because the science is clear that every fraction of a degree matters in limiting the impacts people will face here and around the world. That is why it is important that the world has pledged to enhance efforts to meet it through the Belém Mission to 1.5 and Global Implementation Accelerator. Ambition on emissions reduction goes hand-in-hand with finance to make that possible, including for developing countries. Last year, countries agreed that, by 2035, we would need to mobilise at least $300bn (£230bn) of climate finance annually for developing countries. This year, as a core part of our fight against climate change, we agreed that this finance needs to be targeted at aiming to treble the support to building resilience to climate impacts. Our Brazilian hosts were determined to make this the implementation Cop – and much progress was made outside the negotiating halls. This was, of course, the first Cop in the Amazon, and the UK was proud to work with Brazil in the two years running up to the summit to help it develop the Tropical Forest Forever Facility, which offers an incredibly inspiring solution to global deforestation. We also worked alongside Brazil and many others on the Global Climate Action Agenda, which is about building the coalitions spanning governments, businesses, cities and civil society needed to accelerate action on the ground – on issues from reducing methane emissions and phasing out coal, to unlocking investment in clean energy. Thousands of British businesses were involved in these initiatives. Our researchers, universities, mayors and others were also deeply engaged on climate issues at this Cop. And the UK was key to delivering the final outcomes of this summit, because of our record of climate leadership at home and abroad, as well as the extraordinary skill and determination of our civil service. The message coming out of Belém was clear: despite the noise, clean energy and climate action remain the foundation on which the global economy is being remade and rebuilt. We are up against the march of time and massive global forces that would slow down or stop action. In the face of this opposition, multilateralism is our best hope. For all its flaws, Cop has reaffirmed the belief of the vast majority of the world in this ideal. Those who would deny or prevent action are not winning the argument, they are losing. Ed Miliband is Labour MP for Doncaster North and secretary of state for energy security and net zero