Students of a local school wade through chest-deep water on a flooded street, during a tidal surge. Chaktai, Chittagong. Global average temperatures have risen by 1°C over the last century, and climate scientists believe that warming could be between 3-5 °C by the end of this century. Our oceans absorb around 90% of that heat. But warmer water expands, and this, along with water being released from melting polar ice, is causing global sea levels to rise. Considering present warming trends, a 2013 World Bank paper suggests that Bangladesh will be hit by increasing river floods, more intense tropical cyclones, very high temperatures, and rising sea-levels (a 27 cm sea level rise is projected by the 2040s). This could leave some areas completely submerged, as well as affecting power, food and health. Chittagong is the second-largest city in Bangladesh, densely populated with over 4 million people . It’s often regarded as the commercial capital of Bangladesh , with its port handling over 90% of the country's foreign trade . Quote from Jashim Salam, photographer: “In the past few years, climate change has begun to take a major toll on my home city of Chittagong. Tidal surges – water levels rising significantly above the predicted tide levels – are affecting the city as often as twice a day, resulting in frequent flooding of homes and businesses. Prior to this, the last tidal surge occurred in 1991, when a hurricane hit the coastal area. Local people are growing increasingly concerned - we may have to move from our homes due to this excess of water. The effects of climate change have brought a sudden vulnerability to the lives and livelihoods of people living in Chittagong and the coastal areas of Bangladesh.”

GoodGym runner moving wood from the yard in order to clear it for an annual fundraiser at Spitalfields City Farm, London. Runners taking part in one of GoodGym’s Earth Hour events near City Hall, London. GoodGym have teamed up with WWF this Earth Hour to empower runners to take responsibility for their environment through a series of nature-friendly tasks across the UK. Earth Hour is the world’s biggest switch off event. Each year, millions of people around the world switch off their lights and organise events – at home, in their community or in their towns or cities – to show they care about the future of our planet.