Agence France-Presse: Wall Street’s sickness and its contagiousness for the world economy are bad news for the already faltering effort to craft a new pact to tackle climate change. Tighter budgets, shrinking corporate profits and worries about jobs could crimp manoeuvering room at upcoming UN talks on toughening curbs on greenhouse-gas emissions, sources say. But — so far, at least — the crisis does not appear to be having an impact on investment in clean technology, say these sources. Indeed, …