By Ron Bousso and Shadia Nasralla LONDON (Reuters) -BP shareholders on Thursday backed the energy company’s climate strategy, while fewer investors than last year supported a resolution filed by an activist group urging faster action to battle climate change. The vote at BP’s annual general meeting came as the British government faced growing pressure to hit BP and its rivals with a windfall tax after energy companies posted a surge in profits on the back of rocketing oil and gas prices in recent weeks. BP’s chief executive, Bernard Looney, told the meeting that a windfall tax would not change…