LONDON—Saying its goal was to phase out nearly all emissions by the end of the century, the oil company BP announced Friday that it would be carbon-neutral by 2050. “At BP, we believe that it is vitally important that people, communities, and countries worldwide have access to affordable, reliable, and clean energy solutions,” said CEO Bob Dudley, noting that the company had invested in numerous clean energy programs, including renewable energy sources that operate on both human and solar light, and solar conversion technology that converts methane to liquid hydrogen. “We fully recognize that the energy industry will most likely be one of the biggest polluters in our lifetime, but I promise that we will act responsibly and leave the planet as sustainable as possible for our children and grandchildren.” At press time, BP had revealed plans to cut carbon emissions this year by implementing a “no-carbon-burning” policy for all its natural gas liquids.