We have the tools to break free from fossil fuels. So why haven't we?

The contrast could not be starker: on one side, the Sun, dependable, inexhaustible, freely available to every nation on Earth. On the other side, fossil fuels, finite, hazardous, and extracted at enormous cost to the planet. For over a century, we chose the latter. The consequences are now impossible to ignore. 

Industry and transport, long shackled to the internal combustion engine and shaped by the influence of oil companies, have been among the largest contributors to global warming. But that grip is beginning to loosen, and the alternatives emerging are more varied and promising than most people realise. 

Take biofuels. India, eager to reduce its dependence on energy imports, has increased bioethanol production from waste vegetation and crop stubble — the same agricultural byproducts that farmers once simply burned, releasing harmful carbon into the atmosphere. It's an elegant solution to two problems at once, sidestepping the contentious "food versus fuel" debate by using non-food waste instead of crops. In Europe, Sweden, France, Germany, Italy, and Finland are committing serious capital to its production, and even the UK, which previously showed little enthusiasm for ethanol, is now investing £100 million. 

Biomethane tells a similar story. Produced at scale from animal manure, sewage sludge, and farm residues, it is increasingly stepping in as a direct replacement for fossil-derived methane in both transport and the gas grid. These biofuels don’t perform in conventional engines as well as fossil fuels, but they can be used in other engines and are broadly considered CO₂ neutral, since the emissions they produce are offset by the plants that absorb CO₂ during their growth. 

Then there is green hydrogen. Combusting hydrogen produces no CO₂ whatsoever, making it one of the more exciting prospects in the clean energy transition. It can be used in internal combustion engines and in fuel cells to generate electricity. The catch? Burning hydrogen at high temperatures with oxygen can produce nitrous oxides — toxic compounds that deliver environmental risks. It is a reminder that there are rarely simple solutions in energy; every option carries trade-offs that engineers and policymakers must honestly reckon with. 

On the engine side, that same spirit of honest reckoning is driving a quieter revolution. One example generating interest is the Fluid™ drive, a UK-developed engine concept that claims to run cleanly across multiple fuel types using catalytic combustion rather than direct ignition, producing only water vapour when paired with hydrogen. This illustrates the kind of lateral engineering thinking that the transition away from fossil fuels requires, unburdened by legacy infrastructure or the commercial interests that have long dictated the pace of change. 

What the current moment calls for is a willingness to pursue the most promising ones rigorously and transparently, and to hold them to genuine scrutiny rather than hype. Governments that spent decades subsidising fossil fuel exploration owe it to their citizens to apply that same institutional commitment to the alternatives now available.

The encouraging truth is that the tools exist. Bioethanol, biomethane, and hydrogen are being deployed today. The harder challenge is political and economic: dismantling the infrastructure, incentives, and inertia that keep fossil fuels entrenched long past the point where our climate can afford them. 

The Sun has always been there. We just have to decide, seriously and urgently, to use it.