Conversely, the models suggest that the UK could experience warmer, drier summers in the future. While that may bring some benefits, it could mean increased risk of drought, and extreme events such as the 2003 heatwave could be the norm by the end of this century. Heatwaves could also heighten pressure on healthcare services, because older populations are more vulnerable to extreme heat, and impact on transport, as higher summer temperatures bring the threat of rail buckling and associated travel delays.