By David Gaffen (Reuters) – The world’s biggest gathering of energy industry leaders kicked off in Houston Monday, as Russia’s invasion of Ukraine delivers an oil price shock to the global economy and embattled executives face growing criticism for the industry’s role in climate change. Global oil prices have reached levels not seen since the 2008 financial crisis as disruption to crude and fuel exports from Russia has left the world short of supply, threatening the biggest disruption in energy markets worldwide in decades – one that oil producers say requires a swift response. “Everybody that…