Over the last few decades scientific investigations have established that human activities have a negative impact on our planet's climate, biodiversity and ecosystems. Indeed, all available data clearly show a small but unmistakable rise in global temperatures, mostly caused by the burning of fossil fuels and the resulting greenhouse effect. The telltale signs of this global climate change, evident in the melting of icecaps and the frequency and violence of extreme weather phenomena, are a sober reminder that the ever increasing strain we put on the Earth's resources and natural systems, cannot be sustained for ever