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It’s bad news for those of us who like to fly but are worried about its impact on the environment. A new study says that guilt-free flying still a long way off.Plans for climate-friendly flying rest on creating greener jet fuels that have less impact on the environment. But the Royal Society in Britain concludes there is currently no single, clear alternative to traditional fuel. Flying is responsible for 2.4% of global greenhouse gas emissions. These gases warm the atmosphere, contributing to global warming and climate change. Demand for flights is expected to increase, and governments and the aviation industry are experimenting with ways to reduce the climate impacts of traditional kerosene fuel. The authors of the Royal Society report looked at four options for greener fuels to replace the 12.3m tonnes of jet fuel used annually in the UK. It concluded that none could replace fossil jet fuel in the short term as the Â鶹Éç’s Katie Silver explains (Picture: Male worker fueling jet airliner Credit: Getty / Isannes)