While the interventions of Michael Bloomberg and Great Thunberg will likely gain headlines, there is still uncertainty over whether a final decision can be taken here that will be ambitious and set out a clear timeline for countries to get their pledges on the table ahead of COP26 in Glasgow in November 2020. There is hope that a large number of countries will sign up to long term net-zero emissions targets, and if that happens it will be significant progress. But many eyes here will be closely watching Brussels this week where the new EU commission is due to present a European Green Deal. "What happens in Brussels will resonate in Madrid," said David Waskow from the World Resources Institute.