Spain's second heatwave in less than a month drags on for a fifth day, with temperatures topping 40 degrees Celsius in parts of the country and reaching 39 degrees in the capital. Some Madrid residents comment on the unusually strong heat for the time of year, saying they have seen such temperatures before in August but not in June. Scientists say heat waves have become more likely due to climate change. As global temperatures rise over time, heat waves are predicted to become more frequent and intense and last longer, and their impacts more widespread. IMAGES AND SOUNDBITES