The challenge:Cooking oil waste can be a serious pollutant if it is not properly disposed of. Every litre of oil that enters the rainwater drainage system contaminates 20,000 litres of water, and, ...

The challenge:Access to modern forms of energy remains sporadic or non-existent in much of rural Ethiopia. As a result the population is predominantly reliant on a scarce and depleting supply of solid...

The challenge:In 2007, the City Council of Toronto, Canada, recognised the far reaching impacts of climate change and made a commitment to reduce citywide greenhouse gas emissions by 80% by 2050. To ...

The challenge:Maintaining a resilient food system is essential to feed and nourish a growing global population. Food systems are also closely linked to environmental sustainability including, land use...

The challenge:Greater Manchester, United Kingdom, has set an ambitious CO2 emission reduction target of 48% by 2020, as part of its Low-Carbon Economic Area (LCEA) plan. This will require significant ...

The challenge:In the early 20th century, the United Kingdom had 5,000 to 10,000 mini-hydro schemes, before the national grid became widespread. By the beginning of the 2000s this had fallen to fewer ...