The European colonization of the Americas resulted in the deaths of so many people it contributed to climatic change and temporary global cooling, according to scientists from University College London. A century after the arrival of Christopher Columbus, some 90% of indigenous Americans had perished from "wave after wave of disease", along with mass slavery and war, in what researchers have described as the "great dying". According to one of the researchers, UCL Geography Professor Mark Maslin, the large death toll also boosted the economies of Europe: "the depopulation of the Americas may have inadvertently allowed the Europeans to dominate the world. It also allowed for the Industrial Revolution and for Europeans to continue that domination."