Carbon

UN climate talks start in Doha

Modest expectations marked the start of UN climate talks Monday, as negotiators and experts all warned that the two-week session would only lay the groundwork for a potentially ambitious global-warming pact by the end of the decade.

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Why urban commuters can breathe more easily

David Phelan finds out that London no longer deserves to be known as the ‘Big Smoke’ – and discovers what other communities can do to follow its example