A study published in Communication Earth & Environment focused on how diversified hydrogen production methods could significantly reduce carbon emissions and energy use across key Chinese cities. By combining green and blue hydrogen, emissions could be slashed by up to 96% compared to coal-based hydrogen. This shift is vital for supporting China's 2060 carbon neutrality targets and advancing sustainable urban energy systems. Hydrogen energy is gaining global attention as a clean energy source to combat climate change, with China being a major hydrogen producer but primarily through high-emission fossil fuel methods. The study evaluated 12 hydrogen production methods across cities like Shanghai and Beijing, emphasizing the importance of transitioning to low-carbon hydrogen, including blue hydrogen produced with carbon capture and green hydrogen from renewables. The research revealed that by using diversified hydrogen production methods and a combination of blue and green hydrogen, carbon emissions could be reduced by 65% to 96% compared to coal-based production. The study also projected a significant shift towards renewable electrolysis by 2050, with costs expected to decrease, making green hydrogen more viable in the future. Government support through policies like capital subsidies and tax credits is essential for accelerating hydrogen adoption. Establishing unified certification standards for clean hydrogen can enhance market transparency and consumer trust. Investments in electrolyzer manufacturing, renewable energy infrastructure, and hydrogen distribution are crucial to overcome technical and economic challenges. Overall, the study underscores the significance of diversified hydrogen production in urban areas to achieve substantial emission reductions. It suggests that a mix of hydrogen technologies tailored to regional conditions can greatly contribute to carbon neutrality and sustainable urban energy systems. The findings indicate that blue hydrogen, alongside carbon capture and pricing mechanisms, plays a pivotal role in transitioning towards a greener hydrogen future. Future efforts should focus on addressing storage, transportation, infrastructure, and supply chain challenges to further support sustainable urban development.