By Elizabeth Howcroft LONDON (Reuters) – European stocks opened higher and risk appetite in global markets increased on Monday, but worries about the COVID-19 Delta variant hampering economic growth persisted as investors weighed up the possible timeline for tapering monetary stimulus. After concerns about slower growth dragged stocks and oil prices lower last week, they picked up in Asian trading. The MSCI world equity index, which tracks shares in 50 countries, was up 0.4% at 0803 GMT, recovering after having its biggest weekly fall since June last week. Europe’s STOXX 600 was up 0.3%. Oil p…

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