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Background Rivers along the Cantabrian coast are threatened by fragmentation. Obstacles interrupting the continuity of the rivers have accumulated over the years to the extent that these obstacles can be found almost every kilometre stretch of the rivers. Moreover, they run for some distances (in the order of tens of kilometres). As a result, the river ec ...

Background Cities produce a wide array of air pollutants, mainly from the burning of fuel for heating and from motor vehicles. Many of these pollutants (e.g. NOx, CO2, CH4, black carbon, O3) are also powerful greenhouse gases that contribute to global warming. Cycling generates no significant air pollution, causes negligible noise and has a relatively lo ...