There are many reasons why planting trees is a good idea, but don't be deluded by the proposition that it will help address the challenge of global warming. Apart from the fact that it takes about 20 years before trees become effective at capturing atmospheric carbon, a bit of basic research shows that there is insufficient land available to plant the number of trees required to counteract CO2 emissions. (We run out of land after 187 days). This episode explains why we need to rethink assumptions that planting trees will offset human carbon emissions.

The 'Climategate' controversy started in 2009 when a whistleblower discovered that a scientist had manipulated data relating to changes in global temperature. An alternative interpretation of the incident is that hackers stole emails from The Climate Research Unit to throw doubt on climate data.

The key point about this event is not so much that vested interests will seek to promote their agenda, but that the media seemed more interested in dramatic headlines than understanding the facts. In this podcast, we discuss Climategate and how public perceptions can be manipulated by misrepresenting scientific evidence.

Various governments are investigating geoengineering as a possible option to mitigate the impact of global warming. In this podcast, we assess the risks of geoengineering and consider the dangers of unintended consequences. Some of the proposals are so bizarre that they would seem better suited to the pages of a comic magazine. However, we need to be wary of discounting an idea simply because it seems fanciful. Perhaps human ingenuity can manipulate the forces of nature?

In this podcast, we struggle to understand the logic of converting natural environments to monocultures or the rationale for cutting down vast areas of forest. We question the reasons for using bioethanol when the energy required to produce one litre of fuel is less than the energy it generates. And why does the UN categorise biofuels as clean, green, renewable energy when they produce CO2 emissions that are comparable to burning fossil fuels? This is just one more in the list of 21 Popular Environmental Fallacies.

The commitment by international governments to transition to electric vehicles is one of the success stories in the fight against climate change. However, the switch to electric vehicles brings its own set of problems, including constraints on critical materials, the urgent need to increase electrical generating capacity using genuinely green energy and the social, political and environmental consequences of poorly regulated mining activities. This podcast episode explains why the transition to electric vehicles could have a multitude of unintended consequences.

A global transition to renewable energy presents enormous challenges both in delivering the capacity required and in building an energy infrastructure capable of responding to fluctuating energy demand. This podcast episode considers the challenge of securing 100% of our energy from genuinely clean renewable sources, and it addresses the fallacy that 'renewable energy cannot meet all of our energy needs.'

This podcast considers the impact of plastic pollution and explains why recycling is not a long-term solution. We discuss potential alternatives to oil-based plastic and identify a possible risk if scientists develop plastic-eating bacteria.

Aviation is going green. The development of 'sustainable aviation fuels' (SAF) can significantly reduce emissions from flying and offers the potential to reduce lifecycle emissions by up to 80%. Well, … that is the claim being made by certain sectors of the aviation industry. This podcast considers how these claims might have evolved and sets out some of the key issues that need to be understood.

This podcast episode considers the potential flaws and benefits of carbon capture technologies. We discuss the challenges facing carbon capture projects, including: the financial costs, implications for renewable energy, transporting captured carbon and the difficulties of disposal. The capability to capture carbon is one of the foundation stones of strategies to achieve Net Zero, and governments are committing billions to support carbon capture technologies. Could these funds be used more effectively? What percentage of global GDP would be required to capture all global CO2 emissions? Does a misplaced belief in carbon capture result in governments failing to address the fundamental causes of global warming? As usual, we try to find the light-hearted aspects of a serious topic.

Fallacy 12: Prosperity requires economic growth. This podcast episode considers the relationship between economic growth and prosperity. It looks at what we mean by prosperity and whether it is possible to have prosperity without growth. A continuing growth in GDP is no guarantee that the majority of people will enjoy increasing standards of living, but one thing is clear: ever-increasing economic growth is not sustainable on a planet of limited resources. This podcast discusses four possible scenarios as our global economy strives to become sustainable.