as we ve been hearing from huw, it s the opening day of the climate summit in glasgow where world leaders have been meeting. london s mayor also headed there today with other leaders of global cities to call for more funding and more powers to make the neccessary changes. 0ur environment correspondent tom edwards takes a closer look at the challenges facing urban areas. this summer, flash flooding hit parts of the capital. experts say they ll become more frequent as the climate warms. at euston this morning, mayors from 12 countries took a message to the climate conference in glasgow. the action from world leaders is needed to stop climate change. we ve got to make sure that we can lobby governments across the globe, including our one, to give mayors in cities the powers and resources they need to take action to move away from carbon emissions, to sustainable ways of creating energy, renewables, solar, wind. we have got to retrofit our buildings. we have got to electrify our buses. t