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...Humanity’s impact on the planet Dr Graham Harvey discusses the negative impact humans have on the planet. Global Sweden – no thanks Dr Joe Smith argues that the reality of creating a sustainable global society will be more difficult that then formal rhetoric of global conferences. Business as usual in the landscape of change Dr Stephen Peake discusses how businesses...

...resource. If polluting discharges to a river are intermittent, the river is often able to return to a clean and unpolluted condition as the pollutants are flushed out and carried down to the sea. In addition, because of the organisms present (e.g. bacteria capable of breaking down organic matter), river water has some capacity for self-purification – unless too many of...