The oil and gas industry, which has been accused by activists of hijacking the climate change debate in the Swiss ski resort, has said that it needs to be part of the energy transition as fossil fuels will continue to play a major role in the energy mix as the world shift to a low-carbon economy.Thunberg, who was detained by police in Germany earlier this week during a demonstration at a coal mine, joined with fellow activists Helena Gualinga from Ecuador, Vanessa Nakate from Uganda and Luisa Neubauer from Germany to discuss the tackle the big issues with Birol.Birol, whose agency makes policy recommendations on energy, thanked the activists for meeting him, but insisted that the transition had to include a mix of stakeholders, especially in the face of the global energy security crisis."We can have slight legitimate optimism," he said, adding: "Last year the amount of renewables coming to the market was record high."But he admitted that the transition was not happening fast enough and warned that emerging and developing countries risked being left behind if advanced economies did not support the transition."