Doomsayers and hopemongers alike may need to revise their climate predictions after a study that almost rules out the most optimistic forecasts for global heating while downplaying the likelihood of worst-case scenarios. The international team of scientists involved in the research say they have narrowed the range of probable climate outcomes, which reduces the uncertainty that has long plagued public debate about this field. "It is moderately good news. It reduces the likelihood of some of the catastrophically high estimates. If we were planning for the worst, the worst has become less likely," said one of the authors, Zeke Hausfather, of the Energy and Resources Group at University of California Berkeley. "But fundamentally, it means we must do more to limit climate change. We are not anywhere near on track to do that."