Episodes

As climate impacts mount, pressure is building on policymakers to find ways to alleviate the crisis. One controversial option being explored is geoengineering - direct human interventions to cool the planet. But can we safely and effectively implement these large-scale climate remedies? Bryony Worthington sits down with Kelly Wanser, Executive Director of the nonprofit SilverLining, which conducted early-stage experiments to improve the reflectivity of clouds in an experiment earlier this yea...

Germany is one of the most bullish countries in the world on clean/green hydrogen. The home of the Energiewende is not just one of the most committed countries in the world to reaching net zero, it is of course a highly industrialised nation with a very energy-intensive economy. As if that were not enough, it had one third of its energy supply yanked out from under it as a result of Russia’s illegal invasion of Ukraine. Green hydrogen has become one of the mainstays of efforts to keep the lig...

How does a startup become the largest provider of electricity in the UK in less than a decade? What is locational pricing and how could it encourage more renewables? And is it possible to achieve a zero-carbon electricity system by 2030? Welcome to the first episode of Season 13 of Cleaning Up, in which Michael Liebreich sits down with Greg Jackson, the founder and CEO of Octopus Energy, to uncover the incredible story behind the company's rapid growth and its transformation into a global ene...

In the final episode of Season 12, hosts Michael Liebreich and Bryony Worthington reflect on the key conversations and developments in the net-zero transition over the past three months.

The solar industry has experienced a meteoric rise over the past two decades, growing from a small cottage industry to one of the leading technologies in the energy transition. It’s not been a smooth ride, and there’ve been plenty of bankruptcies on the way, from Solyndra to Suntech, but more than half a terawatt of new solar is now being built each year and the industry is still growing rapidly. So how did we get here, and how far do we have to go? Michael Liebreich is joined by BloombergNEF...

Who are the merchants of doubt and how can their narrative be countered? How much money does it cost to get someone to take action on climate change? This week on Cleaning Up, Bryony Worthington is joined by John Marshall, the founder of the Potential Energy Coalition, a marketing firm that uses data-driven marketing techniques to accelerate the energy transition and climate action. They discuss: How John transitioned from a career in Madison Avenue marketing to founding a non-profit focu...

This week on Cleaning Up, Michael Liebreich sits down with mechanical engineer and YouTube creator Dr Rosemary "Rosie" Barnes to discuss the critical role of engineering in addressing climate change. Rosie shares insights from her work developing clean energy technologies and her popular channel "Engineering with Rosie," where she tackles topics like wind turbine design, the hydrogen debate, and the nuclear power discussion in Australia through the lens of engineering. Rosie and Michael dive int...

Electric vehicles are finally becoming more mainstream, but this hasn’t stopped a flood of negative stories and political attempts to scare people away from making the switch to better, more cost efficient vehicles. So is the EV revolution now inevitable? Bryony Worthington sits down with Ben Nelmes, the Chief Executive of New Automotive, a UK-based not for profit focused on the clean energy transition in road transport. Ben shares his insights on the UK and European electric vehicle (EV) market...

With the UK general election tomorrow, the Cleaning Up team sits down with Dr Simon Evans of Carbon Brief to run through each party's manifesto, and what they say about UK climate and energy policy. With Labour widely predicted to win, will the UK's become an international leader on climate once more? How will GB Energy work? And where will all the money come from to fund the investments needed to turn the UK into a clean energy power house. Dr Simon Evans is the deputy editor and senior poli...

As the world transitions away from fossil fuels, one of the biggest challenges is decarbonizing industrial processes that require consistent, reliable sources of energy to produce high-temperatures. Typically these processes run on fossil gas, but now thermal batteries offer a solution by using electricity to store renewable energy in the form of heat. Anand Gopal, Executive Director of Policy Research at Californian think tank Energy Innovation, joins Baroness Bryony Worthington to discuss h...

Depending on who you ask, methane is either a useful transition fuel to a low-carbon future, or a super polluter. The science of methane says that for natural gas to have a lower climate footprint than other fossil fuels, particularly coal, there can be leakage of no more than 3.2% from end to end. Yet studies across the US show wildly different leakage rates. One of the most influential, by Robert Howarth of Cornell University, puts it at 4.8%, making methane worse for the environment than coal...

Has science cracked the code on mass producing realistic meat substitutes? Or are lab-gown alternative proteins an impossible dream? In this week's episode of Cleaning Up, Baroness Bryony Worthington sits down with president of the Good Food Institute, Bruce Friedrich, to explore the future of food. Friedrich details his vision for a more sustainable food system through technologies like plant-based and cultivated meat and outlines the promising progress and significant challenges remaining in scaling these novel proteins. Worthington and Friedrich debate the roles of policy, public opinion, and big agriculture in determining whether alternative proteins can truly transform our food system or remain forever niche.

As everyone knows, battery prices are plummeting and manufacturing volumes are soaring, whether for EVs or for grid-connected storage. And everyone knows there's a problem: only 5% of lithium-ion batteries are recycled. The rest go to landfill, right? Wrong. This week's guest on Cleaning Up is the world's preeminent expert on battery recycling. Hans Eric Melin is the Founder and Managing Director of Circular Energy Storage. Circular Energy Storage is a London-based data collection and analytics consultancy focused on the lithium-ion battery end-of-life market. They help companies and organisations in the entire battery value chain to take better decisions in everything that relates to reuse and recycling of lithium-ion batteries. They do this by continuously collecting, analysing and publishing data from all parts of the value chain worldwide and by working actively with customers in their strategy and business development.

Last week the leading lights of Europe's electricity industry gathered for the annual Eurelectric Power Summit at the Lagonissi Beach Resort just outside Athens. The conference - under the hashtag this year of #lights on - lasted two days and covered the key issues facing Europe's and the world's power sectors. Two topics in particular stood out: the need to accelerate the build out of transmission, and the pressures and opportunities offered by digitization and AI. At the event, Eurelectric published a brace of reports on these two topics. On the final day of the conference, Michael caught up with Leonhard Birnbaum, Chairman and CEO of German utility and distribution grid operator E.ON and President of Eurelectric, on a sunny and windy terrace just outside the conference centre to discuss all this and more.

China's policies that direct capital towards cleaner industries have been game changing, and this week we're continuing the China theme, sharing two conversations Bryony had earlier this month at a conference at Xiamen University in Fujian Province. China's role in the clean energy transition could not be more important. The think tank Ember's latest report on the state of the global electricity transition states: over half of the world's new wind and solar power capacity last year was added in China, and together with hydro and nuclear, clean electricity in China now meets 35% of their electricity demand. And yet, the scale and the nature of the Chinese economy is so enormous it's hard to grasp, the majority of which is still powered by roughly 1000 gigawatts of coal-fired power stations, half of the global total. The focus of the conference was on a specific lever that could help China further along its decarbonisation path: the repowering of existing coal stations with clean source…

In this week's episode of Cleaning Up, we find how much and how much more governments would have to spend for hydrogen to live up to its hype. This audio blog is adapted from a piece Michael wrote at the end of last year for BloombergNEF, entitled "Clean Hydrogen's Missing Trillions", which estimated that hitting the Hydrogen Energy Ministerial target of 90 million tonnes of clean energy by 2030 would require subsidies of at least $2.3 trillion to be on the table right now, while the actual figure at the end of last year was 1/10th of that. Although the figures have changed a bit since then, the message remains the same: the subsidy gap remains in the multiple trillions of dollars. It should not therefore be surprising that the news is full of projects being cancelled and delayed. In fact, that will be one of the main hydrogen stories through to 2030 and beyond.

Up this week is Simon Holmes à Court, the Australian investor and philanthropist with a passion for using data to change the world. In 2022, the federal elections in Australia delivered an upset, as around a third of the electorate turned their back on the established parties and voted in seven new independent MPs taking the total to 10. Simon was responsible for a crowdfunding initiative - Climate 200 - that supported 23 candidates in all, pledging to act on climate, political integrity and gender discrimination. He remains very involved in the challenge of pivoting Australia from a fossil fuel based economy to a clean energy superpower.

How can we build a more united climate movement? What should be the role of geoengineering? And how can indigenous voices be brought into the climate conversation? Bryony puts these questions to model, actor, director, ambassador and businesswoman, Lily Cole.

Welcome to Season 12 of Cleaning Up! If you want a sense of the trajectory of climate action, you have to understand China, and you have to understand finance. There is no one better to share insights on both than Dr Ma Jun, Founder and President of the Institute of Finance and Sustainability in Beijing.

Bryony and Michael round up the eleventh season of Cleaning Up this week. They explore the themes running through the episodes, from theories of change to innovation, and discuss the things that surprised them, the moments they liked (or didn't) and reasons for optimism for the transition.

Michael chats with Saul Griffith, Australian-born engineer, inventor, advisor, author and 2007 MacArthur "Genius". He specialises in clean and renewable energy technologies, and has founded a dozen technology companies across 20 years in Silicon Valley, as well as authoring 3 books, including `Electrify', and `The Big Switch'. He has recently turned his attention from Otherlab, his independent Research and Development lab, to policy work and writing, including founding Rewiring America and Rewiring Australia, non-partisan organisations dedicated to electrification and decarbonisation and the associated policy and regulatory implications of meeting our climate goals.

Bryony speaks to two fascinating guests, both specialising in methane emissions, their causes and impacts: Dr. Sebastien Biraud and Sharon Wilson. Dr. Biraud is a biogeochemist, leading the Climate Sciences Department. Sebastien's work has taken him to the tropical rainforests of the Amazon, the great plains of the United States, and the Arctic tundra. He is currently co-leading/leading projects for the U.S. Department of Energy and the California Energy Commission. These projects involve integrating and applying high-precision greenhouse gas observations to advance research on the atmospheric carbon cycle and to enhance measurement, reporting, and verification of greenhouse gas emissions. Sharon is a 5th generation Texan who, after 12 years working for the oil and gas industry in Ft. Worth, left and bought 42 acres in Wise County. Unknown to her at the time was that George Mitchell was experimenting in Wise County to figure out how to produce oil and gas from shale. She had a …

This week, Michael presents the second part of his two-parter for Bloomberg New Energy Finance, exploring the bear and bull cases for the net zero transition. This week is the bull case: the "5 superheroes" of the transition, 5 forces/trends even more powerful than last week's "5 horsemen", which can prevail in the challenge of rapidly decarbonising the global economy. The 5 superheroes are: Exponential Growth, Systems Solutions, Great Power Competition, Disappearing Demand, and the Primary Energy Fallacy. And stay tuned until the end for a 6th "bonus" superhero! This audioblog is based on Michael's Bloomberg New Energy Finance opinion piece of the same title.

Michael is solo this week on Cleaning Up, outlining the "5 horsemen" of the net-zero transition - the five greatest obstacles to the net zero transition. These 5 horsemen are: the economics of energy solutions, the electrical grid, the demand for critical mineral, political and social inertia, predatory delay by the powerful incumbents. This audioblog is based on Michael's Bloomberg New Energy Finance opinion piece of the same title.