The latest UN climate report this week raised the alarm over the "irreversible" impacts of climate change, such as rising seas and coastal flooding that we will continue to experience for centuries or longer — even if we stop emitting greenhouse gases and halt global warming now. "We are now committed to some aspects of climate change, some of which are irreversible for hundreds to thousands of years," said Tamsin Edwards, a climate scientist at King's College London and co-author of the Intergovernmental Panel on Climate Change (IPCC) report released Monday. The good news is that some impacts, such the warming of the Earth's surface, can be reversed by removing carbon from the atmosphere — at least in theory.