Greta Thunberg delivered a powerful speech at this year’s UN climate change conference (COP25) in Madrid. The Swedish activist said “we no longer have time to leave out the science,” and she accused world leader of “clever accounting and creative PR” to avoid action on the climate crisis. Thunberg said the world’s rapidly declining carbon budgets would be gone within eight years based on current emission levels. “How do you respond to the fact that basically nothing is being done about this without feeling the slightest bit of anger? And how do you communicate this without sounding alarmist? I would really like to know,” she said.