Climate activist Greta Thunberg on Wednesday denied a public order offense after she was arrested last month at a demonstration against a major oil and gas industry conference in London. The 20-year-old Swedish environmental campaigner was among more than two dozen people charged after protesters sought to block access to the luxury InterContinental Hotel in central London during last month's Energy Intelligence Forum, attended by some of the industry's top executives. Thunberg was charged with breaching a section of the Public Order Act that allows police to impose limits on public assemblies.