By Shadia Nasralla LONDON (Reuters) – The British government’s 5 billion pound ($6.29 billion) windfall tax plan for oil and gas producers includes an incentive for those producers to pump more fossil fuels, riling climate activists who had called for the tax. Tax bills for oil and gas producers, including the new additional 25% levy on profits, can be reduced significantly with higher investment specifically in oil and gas projects. “Within the levy, a new ‘super-deduction’ style relief is being introduced to encourage firms to invest in oil and gas extraction in the UK,” the government’s Tre…