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Scientists in Sweden have recently unveiled a groundbreaking molecular system that could revolutionise residential heating. This innovation involves a specialised liquid capable of capturing solar energy and storing it for an impressive duration of up to eighteen years. Functioning similarly to a rechargeable battery, the system allows for the release of energy in the form of heat precisely when required, offering a sustainable alternative to traditional energy sources. The technology relies on a specifically engineered molecule composed of carbon, hydrogen, and nitrogen. When exposed to sunlight, this molecule undergoes a transformation into an ‘isomer’—a term describing a molecule with the same atoms but a different internal arrangement. This new structure effectively traps solar energy within its chemical bonds. One of the most significant advantages of this breakthrough is the lack of carbon emissions. Furthermore, unlike conventional batteries which gradually lose their charge, this chemical system remains remarkably stable. This stability implies that energy could be transported across vast distances or stored for long periods without any significant degradation. For instance, energy collected during sunny summer months could be utilised to provide warmth during harsh winter conditions. Environmental specialists are optimistic, noting that while the technology is currently in its experimental stages, it holds immense potential for sustainable urban planning. Projections suggest that the first commercial applications may be integrated into large residential complexes by the end of the current decade. This progress is the result of years of rigorous research aimed at finding renewable energy solutions that are both efficient and accessible to the public. Nevertheless, the path to global implementation is not without obstacles. Some critics point out that the expenses associated with mass-producing these specialised chemicals must be lowered to ensure widespread adoption. Despite these financial concerns, the scientific community maintains a positive outlook regarding the transition away from conventional power grids. Experts generally agree that such advancements are crucial for mitigating further environmental damage. As these innovative solutions emerge, global perspectives on energy consumption are undergoing a rapid and necessary transformation.

1. What is the main purpose of the article?

• A.To compare different types of liquid renewable energy.
• B.To describe a new way to store solar energy for long-term use.
• C.To explain the chemical composition of fossil fuels.
• D.To argue against the use of traditional power grids.

2. According to the text, how does the Swedish molecular system differ from conventional batteries?

• A.It requires sunlight to be recharged every few hours.
• B.It is significantly cheaper to produce on a large scale.
• C.It can hold its charge for a much longer period without losing power.
• D.It is only effective when used in extremely cold climates.

3. What can be inferred about the ‘isomer’ mentioned in the text?

• A.It is a type of fuel extracted from nitrogen and hydrogen.
• B.It stores energy by changing the internal arrangement of its atoms.
• C.It is a dangerous byproduct of burning fossil fuels.
• D.It is an unstable molecule that releases heat spontaneously.

4. What is the general attitude of the scientific community towards this discovery?

• A.They are doubtful that it will ever be used in urban areas.
• B.They are confident it will replace all other energy sources by next year.
• C.They believe it is promising but recognize that costs must be reduced.
• D.They think the technology is already perfect for global adoption.

5. What does the word ‘rigorous’ in the third paragraph mean?

• A.Fast and efficient.
• B.Careful and thorough.
• C.Dangerous and risky.
• D.Simple and easy.