They may however also represent a driver to change, as evident in the greater emphasis which is being placed by increasing segments of -mainly industrialised countries' - populations on the quality and sustainable production process of the food that they consume. Actions aimed at accelerating this shift to more sustainable lifestyles should involve all stakeholders, and should be tailored to national and regional lifestyles and mindsets. International research efforts not only need to focus on sustainable productivity growth, but also on improving our understanding of key linkages between physical (e.g. atmospheric GHG concentrations and climate change), biological (e.g. crop and livestock productivity in different agro-climatic conditions) and behavioural variables (e.g. consumers' long-term response to large changes in income).