A previously unknown process that seeds cloud formation over the Arctic is driven by melting sea ice, but what effect could it have on future climate change? Researchers discover a new process that could impact the climate by altering cloud cover, sunlight reflection, and future climate change. As climate change melts the Arctic ice, its exposed edges are revealing a previously unknown natural processes that is increasing the number of cloud-forming particles in the region. The strongest effects were observed in the marginal ice zone, a narrow band where open ocean meets melting sea ice and where marine algae are most productive. As Arctic sea ice retreats, this band is getting wider.