London was calling while it was cooking- why Parliamentarians must lead the next phase of climate action

There is something profoundly different about discussing climate change while experiencing it.

As I travelled between events during London Climate Action Week (LCAW) 2026, from conversations on climate finance and energy transition to exchanges with policymakers, investors, legislators and practitioners, one reality became impossible to ignore. London was in the grip of an intense heatwave. Commuters sought refuge wherever shade could be found. Rail services were disrupted. Parks filled with people escaping the relentless heat. Even conversations that ordinarily began with introductions instead opened with a common observation: it is unbearably hot. 

When United Nations Secretary-General António Guterres remarked that "London isn't just calling- it is cooking," his words captured what everyone present could already feel. Climate change had become more than the subject of the week's discussions; it had become the setting in which those discussions were taking place. There could hardly have been a more fitting backdrop for a week dedicated to accelerating climate action.

Yet, beyond the symbolism of the heatwave, what struck me most was how much the conversation itself has evolved. Compared to previous climate gatherings, London Climate Action Week 2026 felt less concerned with announcing new ambitions and far more focused on delivering existing ones. The defining questions were no longer why we should transition to a low-carbon economy, but how we remove the financial, legislative and institutional barriers preventing that transition from happening at the pace science demands.

As an environmental lawyer and someone whose work spans climate governance, sustainable finance and energy transition, I found this shift both refreshing and timely. More importantly, it reinforced why institutions such as Climate Parliament have never been more relevant.

Throughout the week, two themes consistently surfaced: climate finance and electrification. Neither is new, though. However, what became evident was that they are no longer separate conversations. They are two sides of the same implementation challenge. Climate finance determines whether countries can build the energy systems they need. Electrification determines whether those investments translate into greener economies, expanded energy access and resilient communities.

The challenge is directing capital to where it is needed most, the projects capable of transforming lives.

One of the strongest messages emerging from the climate finance discussions was that the world does not necessarily suffer from a shortage of capital. Rather, it suffers from a shortage of bankable, de-risked and well-governed projects capable of attracting that capital, particularly across emerging markets and developing economies.

That observation resonated deeply with my own work. Much of my current research examines whether Uganda's legal and regulatory framework is sufficiently equipped to absorb blended finance for off-grid solar development. International investors are willing to finance renewable energy. The greater question is whether domestic legal frameworks provide the certainty, transparency and accountability that enable those investments to flourish.

In many respects, this is where climate finance becomes a legislative issue as much as a financial one.

Parliamentarians approve national budgets, enact investment laws, oversee public expenditure and scrutinise government policy. They create the legal certainty upon which long-term climate investment depends. Without supportive legislation, even the most ambitious financial commitments struggle to delivermeaningful impact. This is precisely the difference Climate Parliament has made over the years. A case in point is Zambia's Presidential Constituency Energy Initiative (PCEI), which was initiated by one of the Zambian MPs within the Climate Parliament network of legislators, drawing inspiration from the Rio Parliamentary Green Investment Summit it convened ahead of COP30 in Brazil. Approved by Cabinet in late November 2025, the initiative will build a small solar-plus-storage plant in each of Zambia's 156 constituencies, for a combined target of 312 megawatts. It is being rolled out by the newly formed Zambia National Energy Corporation, with recent tenders specifying roughly 2.3 MW of solar capacity paired with about 4 MWh of battery storage per site, connected into existing substations for rapid deployment. Funding blends a redirected share of the Constituency Development Fund with private investment and the power will be sold to national utility ZESCO, giving each constituency a lasting local income stream. The push follows drought-hit hydropower shortfalls, making distributed solar a faster route to added generation capacity and energy resilience.

Climate Parliament’s work recognises a truth that became increasingly apparent throughout London Climate Action Week: the global energy transition will ultimately succeed or fail in national assemblies.

One of the most compelling discussions I encountered explored how countries can accelerate electrification without simply shifting demand onto electricity systems that remain underprepared. Whether the focus was electric mobility, industrial decarbonisation or clean cooking, the underlying message remained consistent: electrification is not simply about replacing one technology with another. It is about redesigning economies around clean, affordable and reliable electricity.

That ambition aligns closely with the Global Renewables and Energy Efficiency Pledge launched at COP28, through which countries committed to tripling global renewable energy capacity and doubling the rate of energy efficiency improvements by 2030. Achieving those targets will require far more than technological innovation. It will demand legislative leadership, sustained public investment and policy certainty capable of unlocking private capital at scale. 

Climate Parliament’s Green Energy Constituencies initiative, now being advanced across several countries, embodies precisely the kind of locally driven implementation that many discussions in London repeatedly called for. The principle is simple but powerful: clean energy transitions become meaningful when they reach communities, health centres, schools and small businesses, not merely when they feature in international communiqués.

That lesson extends well beyond Africa. 

One comment made during a discussion on electric mobility has stayed with me. The challenge, it was argued, is ensuring that chargers are located where people actually live and work not just installing more of them. It was a reminder that implementation succeeds or fails in the details.

The same principle applies across the developing world. Building a solar mini-grid in rural Uganda, modernising electricity distribution in Zambia or expanding renewable energy deployment in Ghana each requires more than engineering expertise. They require legislation that inspires investor confidence and institutions capable of translating policy into practice.

That is why I left London with renewed optimism. Not because the climate crisis has become less urgent; certainly, it has not. If anything, the heatwave served as a stark reminder that climate change is accelerating faster than many expected. Rather, I was encouraged because the conversations themselves have matured. There is growing recognition that the technologies already exist. Climate finance is evolving rapidly. The economic case for electrification has become stronger than ever.

What remains  scarce is implementation.  It does not happen by accident. It is legislated, budgeted, regulated and it is overseen. Those responsibilities rest squarely within the remit of parliaments.

As someone actively involved in the climate finance and energy transition landscape in Uganda and indeed across the globe, I have come to appreciate that meaningful climate action rarely begins with grand speeches. More often, it begins with careful committee deliberations, informed legislative scrutiny, budget approvals and policy reforms that quietly reshape national development trajectories. International conferences can generate momentum, but it is parliamentarians who convert that momentum into enforceable laws and lasting institutions.

Walking through a sweltering London, I was reminded that climate change no longer regards geography. Yet while the impacts are becoming increasingly global, our capacity to respond remains deeply unequal. For many countries across Africa, climate resilience, energy access and sustainable development remain inseparable objectives. We cannot speak of decarbonisation without also speaking of development, nor discuss energy transition without addressing climate finance. 

The conversations held across London and indeed in nearby Oxford, where sustainable finance featured prominently throughout the week, offered reasons for cautious optimism. But optimism alone will not reduce emissions, electrify communities or finance resilience. That work continues well beyond the conferences. As attention gradually shifts towards Climate Week NYC and ultimately COP31, perhaps the most enduring lesson from London Climate Action Week is this: the future of climate action will not be determined solely by the ambition of international agreements. It will be determined by the quality of national legislation, the courage of political leadership and the willingness of parliamentarians to turn promises into policy.

London reminded us of what is at stake. Climate Parliament mobilises and empowers legislators worldwide to lead the way. 

Howard Mwesigwa 

Uganda National Coordinator