According to a report, heat waves from Japan to Algeria went high in 2018. Dr. Dim Coumou from the Potsdam Institute for Climate Impact Research (PIK) said that human-caused global warming is the reason for climate change. This causes the badness of heat waves and heavy rainfall. The warming that is taking place in the Arctic is one of the examples of climate change. Experts said that the changes are not yet sure to have been caused by humans.