Congestion in cities is a problem of growing importance. New infrastructure for transport however often gives rise to conflicts about how the cost of new services will be met by the public, and about how the demand for travel can be reconciled with efforts to improve the social and environmental...

Oil, coal and natural gas will remain the world’s dominant sources of energy over the next decades, with resulting carbon dioxide emissions set to increase to unsustainable levels. However, technologies that help reduce CO2 emissions from fossil fuels can reverse this trend. CO2 capture and...