Chief executives of some of the world’s largest energy companies on Monday sought to defend themselves from criticism, saying it is not possible to keep everyone happy amid the planned energy transition.

Speaking at the ADIPEC oil and gas conference, which opened in Abu Dhabi on Monday, executives representing energy majors in the U.S., Europe and Asia sought to strike a positive tone on the current state of play for the fossil fuel industry.

It comes shortly after climate protesters took to the streets in hundreds of cities across the globe to demand that world leaders phase out the burning of fossil fuels, the chief driver of the climate crisis.