The scientific evidence is overwhelming and unequivocal, climate change is a stark reality. It is largely caused by human activities and it presents very serious global risks for people and biodiversity around the world and it demands an urgent global response. Human activities, especially the burning of fossil fuels, are releasing rapidly increasing levels of greenhouse gases such as carbon dioxide. This is causing the atmosphere to heat up. We do not have the luxury of standing by for years before the world gets round to making a serious attempt to cut its emissions. The next few years will be critical….