COLOGNE, Germany - Windfall profits that power generators are making from Europe's carbon market are damaging the integrity of the scheme, a senior European Commission official said on Thursday. "It's undermining the credibility of the scheme. It would be helpful if participants think very hard about it," said Jos Delbeke, director at the EC's climate change directorate, speaking at a World Bank-sponsored carbon conference. Europe wants to show the world its flagship climate policy is working, ahead of global climate change talks in December in Bali, Indonesia, on a deal to extend the Kyoto Protocol. "A working European emissions trading...