LONDON (Reuters) - OPEC’s secretary general said on Wednesday there were grounds for optimism that 2021 would be a year of recovery after the slump in oil prices and demand caused by the pandemic. “While there are grounds for optimism that 2021 will be the year of recovery ... there are many other uncertainties that lie ahead,” Mohammad Barkindo told a virtual International Energy Forum event. Barkindo also said there was no prospect of a peak in oil use on the “immediate horizon.”